Assemblies and builds
Define an assembly’s bill of materials, build finished goods that consume component stock, and see how component cost rolls into the finished item.
- Plans
- Advanced and above (inherited by Firm and Enterprise)
- Availability
- Available
- For
- Owners, Bookkeepers
- In KontoCore
Inventory → Assemblies
What this does
An assembly is an inventory item made from other inventory items. Its bill of materials lists components and quantities per unit.
A build consumes components and adds finished units at the components’ combined cost. This is light assembly, not full manufacturing planning — there is no capacity scheduling or shop-floor routing.
Before you start
- Set up every component as an inventory item with stock.
- Create the finished item as an assembly.
How to
Define the bill of materials
- 1Inventory → Assemblies → open or create the assembly.
- 2Add components and quantity per finished unit.
- 3Save.
Build
- 1Choose Build, enter quantity, date, and warehouse.
- 2Confirm component availability (and lots/serials if tracked).
- 3Post the build.
Statuses and lifecycle
| Status | Meaning |
|---|---|
| Draft build | No stock moved. |
| Posted build | Components consumed, finished units added. |
| Reversed | Components returned, finished units removed. |
Corrections, voids, and reversals
- Reverse a posted build to undo it; editing the BOM affects future builds only.
- Posted records are never edited in place. Void or reverse them; KontoCore records a linked reversing entry with the user, time, and reason.
Provider and availability notes
- Inventory work happens in the browser workspace. Dedicated mobile warehouse apps and handheld barcode-scanner integrations are not offered.
- Labor and overhead are not automatically absorbed into build cost; record them separately if your accountant requires it.
Permissions
- Owners, administrators, and users with bookkeeping or inventory permission can create and post. View-only users can read but not change records.
What happens in your books
Building 10 units from components costing $12.00 each in total:
| Account | Debit | Credit |
|---|---|---|
| Inventory Asset — finished goods | 120.00 | |
| Inventory Asset — components | 120.00 |
Common mistakes
- Selling assemblies before building them, driving finished quantity negative.
Troubleshooting
Build blocked
A component lacks quantity at that warehouse on the build date.
Related articles
InventoryTrack product quantities and cost, adjust stock, and understand advanced warehouses, lots, serials, and assemblies.Inventory items: set up tracked productsCreate quantity-tracked inventory items with income, expense, and asset accounts, a costing basis, reorder points, and optional lot or serial tracking.Lot and serial number trackingTrack batches by lot (with optional expiry) or individual units by serial number through receiving, transfers, adjustments, and sales for traceability.Stock on hand and inventory valuationRead quantity on hand, committed and available stock, average cost, and inventory value, and reconcile the valuation report to the Inventory Asset account.
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Last reviewed October 6, 2026