Thanks Kenin, i was guessing that from what i have been read, shame theres no logical way as in real life there plenty of times the same sub_cat could do with being under/in a main_cat, like for us we need sub cat ‘note pads’ under both main categories ‘paper & pads’ and ‘office’ etc.
Only way i can think we can achieve what we need is create a new category say for example, ‘note pads 2’ under the second Main_Cat. Then put all same products in both sub cats in bulk via. Just looks a bit daft on breadcrumbs Main-Cat > Note Pads > Note Pads 2 > ProductName.
We have 2 parents, id love my sub cats to have 2 also.