Your product is a structural BOM: a finished assembly built from sub-assemblies built from parts. Fast Production Software gives each level its own work order, kit issue, WIP and transfer — so the busbar sub-assembly and the panel it feeds are one connected tree, and you can see exactly which tier a delay is at.
The finished product has a bill of materials, but the sub-assemblies inside it are just line items. Nobody plans, kits or tracks the SFG that the whole assembly waits on.
The line starts, then stops — one fastener or one bracket was never issued. Without a BOM-exploded kit and a reserve step, the shortage is found on the bench, not on the requisition.
Sub-assemblies pile up in trays or vanish into the next job. There is no on-hand figure for a semi-finished good, so you over-build some and starve the line of others.
The final assembly is late, but is it waiting on a sub-assembly, a bought-out part or a rework? With one flat status, the tier that is actually stuck stays invisible.
Every stage of a multi-level assembly in Fast Production Software is a real document on the shared stock engine. Sub-assemblies are built first and roll up to feed the higher-level assembly — the same reserve, issue, WIP and transfer discipline at each tier.
A multi-level assembly follows a predictable shape — explode the tree, build the sub-assemblies, roll them up, finish the top. Each question a planner asks is answered by a record that already exists at the right tier.
A manufactured assembly is not a flat parts list — it is a tree. Fast Production Software holds the full structural BOM: material positions and resource lines against a header, revision-controlled and released for production. It explodes downward from the finished good to every sub-assembly and raw material, and where-used runs the other way so you can see every parent a shared bracket or fastener sits in. See BOM & Bill of Resources for the full model.
A sub-assembly is built exactly like any other item — a lower-level work order reserves and issues its material, runs its route, and books good and reject WIP at each operation. When it is complete it is transferred into stock as a semi-finished good, using the same mechanism as an FG transfer. That SFG then feeds the higher-level assembly work order as one of its issued components, so the tree rolls up level by level.
An assembly line stops for the one part that never arrived. Fast Production Software explodes the released BOM for the work order into its child components and sub-assemblies through a production requisition, earmarks each line against the order (RES/WO), then issues the full kit to the line (ISS/IWO — the real stock deduction). Short or missing lines are visible on the requisition before the kit leaves stores. See material issue & WIP.
Because every tier of the tree has its own work order, its own material issue, its own good and reject WIP and its own transfer, you see the state of the whole structure at once — not just the top assembly. When the finished product is late, the tier that is actually stuck is obvious: a sub-assembly still in WIP, a bought-out part short, or a child part in rework. See how operations and route sheets drive each level.
When the assembly route is complete the finished product is transferred into stock (FGM/FGM then FGP/FG), lot-tracked where it matters, and is immediately on-hand for dispatch. Parts that fail on the line are captured at part or child-part level against the work order, and a rework decision opens a self-contained loop — a rework route, tracked good/reject, then salvage back to FG or into the main flow. See FG, rejection & rework, and how it hands to Fast Inventory & Quality.
An indented FG → SFG → RM tree with where-used, revision control, release (status 4) and level-by-level BOM costing that rolls material and resource cost upward.
Each SFG built on its own work order — its own material, route and WIP — then transferred into stock and issued up into the higher-level assembly.
A BOM-exploded component kit reserved (RES/WO) then issued (ISS/IWO) to the work order, with short lines flagged before the line starts.
Route sheets, work centers and operation times per level — good and reject WIP booked at every operation, so each tier reports its own progress.
Semi-finished goods roll up to feed the next tier; finished assemblies land in stock as FGM/FGM + FGP/FG, lot-tracked, on-hand for dispatch.
Child-part rejection captured against the work order at any tier, with a self-contained rework loop that salvages parts to FG or back into the main flow.
Yes. A manufactured item carries a structural BOM that explodes as an indented tree — FG to SFG to RM — revision-controlled and released for production before the floor can use it.
A lower-level work order builds the SFG, which is transferred into stock the same way an FG is, then issued up into the higher-level assembly work order as a component.
Yes. A PRMR explodes the BOM for the work order, the lines are reserved (RES/WO) and then issued as a kit (ISS/IWO), with short lines flagged before the kit goes out.
Every tier has its own work order, material issue, good/reject WIP and transfer — so you see progress and rejections at each level, not only at the top assembly.
The BOM explodes downward from the assembly to every child; where-used runs back up, showing every parent that consumes a component — useful before an engineering change.
Yes. BOM costing rolls material plus resource and process cost up each level, so a sub-assembly's cost becomes an input to the assembly above it and to a full unit cost.
Make-to-order sheet-metal and machined work with per-order BOMs, process sheets and job cards for the floor.
Learn moreAPQP/PPAP parts with work-center routing, in-process inspection and line rejection and rework tracked per work order.
Learn moreMake-to-order and make-to-stock plants running work orders from a sales or production plan through to finished-goods transfer.
Learn moreThe engineering definition behind every assembly — multi-level material structure, resources, release and costing.
See the featureA 30-minute demo — we take one of your real multi-level products through BOM explosion, sub-assembly build, kit issue, roll-up and FG transfer, tier by tier.
