Concatenate 2 field

Hi

All of our part have two field called description 1 and description 2 which are basically one field cut in two field of up to 25 char.

What I want to do is concatenate them both into a third field which I would then use for the BOM.

Ideally I would like to concatenate straight in the BOM with no third field required

Alternatively It could be a third field that update automatically or at least when the part is loaded in memoy

In last resort I'm OK with running a macro on each of part

I know VBA enough to understand other people code and auto-generated solidworks macro but not enough to write one from scratch

SolidworksApi macros