Yamaha DX-7 & Hcard-701 questions?

Hello all,

Ive been getting back into messing around with my DX7 and saw a cartridge that can do a lot (acts as a 400 in 1 type of cartridge that comes with many sounds but has even more room for other sounds) but I was curious about a couple things. When it comes to mass sound dumps and moving many sounds to and from the synth, are there easy techniques to move multiple sounds at once or if there's a blank/new cartridge involved do I have to move sounds one at a time onto the synth, and then move them from the synth onto the card? Forgive me if this is a very simple question but it's not my forte.