RM 2.0 Items that belong in two categories

Our organisation has just inherited an absolute ton of material from a deceased member.

Much of the material has huge historical significance for us, and we need to get it scanned and archived onto xenForo Resources ASAP.

The trouble is, some of the material 'fits' within two of our existing categories.

Is there a way of submitted a resource just once, but having it available from two categories?