I'm assuming you have some physical cards, yes? Once you deplete those, log into the Disney gift card site and transfer digital onto physical. As long as a card has been previously activated, you can put funds on it even though it's currently at zero balance. You just can't put funds on a brand new card you might grab off the shelf without ever activating.
Thank you! for some reason i thought i could not commingle physical with digital. I will do this right now...