To tell Sage 50 what items you want to use in an assembly, select the Bill of Materials tab in the Maintain Inventory Items window. (This tab is only available if an assembly item ID is selected.)
Once you have transactions that use an assembly, such as purchases or sales invoices, you cannot change the components in the assembly. However, you can copy an assembly and modify the copy as a new assembly.
Once you have transactions that use an assembly, such as purchases or sales invoices, and you need to make changes the components in the assembly, you will need to enter a revision. You can create a revision by selecting the Revisions button from this tab. (Sage 50 Quantum Accounting)
Once you enter the components on the Bill of Materials tab and click Save, you need to "build" the assembly.
The cost of building the assembly is posted when you actually create quantities of an assembly item, using Build/UnBuild Assemblies from the Tasks menu.
Components of the Assembly
Item ID: You can enter a ? or click the right mouse button to select an existing inventory item from the look-up list.
Description: This is the short description of the inventory item. You cannot change this description once the assembly item is saved for the first time.
Quantity Needed: This is the amount of this item needed to build one assembly item.
Print Components on Invoice: Select this check box if you want all of the components of an assembly to print on quotes, sales orders, invoices, and credit memos. If this box is not selected, then only the assembly prints on invoices and on quotes, sales orders, invoices, and credit memos.
Add: Select this button to add an inventory item to the assembly.
Note: You cannot modify the components of an assembly once you have purchased or sold the assembly.
Remove: Select this button to remove an inventory item from the assembly.
Revisions: Select this button to make a revision to the bill of materials for this assembly. Revisions can only be entered if the assembly has been used in a transaction. Tell me more about using revisions. (Sage 50 Quantum Accounting)
If you no longer want to use this specific assembly, you can unbuild it so there are no quantities of the assembly in stock. Then you can copy the assembly to a new one and modify the new assembly. You could then make the old assembly inactive (by selecting the inactive check box on General tab of Maintain Inventory Items) so you will be warned when selecting it for a transaction.