Bare PCB part num vs PCBA num

Is there a way in KiCAD to assign a part number to the bare PCB separate from the PCB assembly? I am coming from Eagle where I always named the project files the bare PCB part number and did the bill of materials outside of Eagle.
Using KiCAD now I would like to take advantage of the BOM generator. In some cases I may have multiple assembly part numbers using the same bare pcb number. The difference being some parts that are not populated on one.

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not sure if this is what you’re looking for, but sometimes I put the bare PCB part number into a symbol on the schematic. so then when I go to create the BOM it’s listed just like all the other parts. then you can customize it for whatever the client’s system needs.
i just have a little symbol like this.

Not exactly what I was envisioning but a very clever workaround. Thanks!