**Feature Request** The ability to associate BOM attributes to custom groups. It would be very handy if there was an extra select or text input to group attributes. And have the new attribute Group and Key automatically populated with the previously entered values so i don't need to re-enter them all the time. I have 3 different sources to order my parts, LCSC being one of them, and i also want to try to get seeed to assembly my PCB. It would be very handy if i could have a different attribute for each distributor and the ability to choose which one to export the BOM for. This would also mean that you could use a different distributor / assembler to me, but we can both use the same PCB.