AFAIK there is no way to add more choices for the columns available. You may wish to add this as a feature request on the uservoice site. This uservoice entry seems like it is requesting what you're looking for: https://kace.uservoice.com/forums/82699-sma-k1000/suggestions/12281328-add-custom-inventory-rules-to-inventory-devices-pa
Can you please elaborate what you mean ?
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