Transfer elements from one collection to the other for one user

Is this possible?

For example to transfer banknotes into another collection, now the my older girl is interested in coins only, while the second is interested in banknotes.

Thank you

You can only do that 1 item at a time. You can't do a mass transfer all at once. I don't know what it would take to create that ability.

The only fast way that could be possible would be to ask Xavier, if he says no it will be to old manual way.

Only 82 items to change. Shouldn't take more than 15-30 minutes.