Is there anyway to combine visa gift cards?

I have 3 Visa gift cards, all with >$10 on each. Is there any way that I can combine the cards into one balance or transfer to PayPal? One of the cards only has like $2 on it, and it's not really feasible to use it in store.

If not, are you able to use multiple cards on one transaction? (specifically, Target in-store if possible)

Thanks in advance!