I have 8 Nvidia RTX 3070 GPUs and want to mine two different coins at one time. 4 of the GPUs mining coin A and 4 GPUs mining coin B.
Depending on the coins you can dual mine (depends on the miner).
For instance, you could mine eth, zil and alph on the same card. Or you can mine eth and ergo, rvn, flux or other coins. Depends on what miner you use
Otherwise you can set 4 on one miner and you can use another miner for the other 4 gpus. You do this on the flight sheet (add miner)
add a miner to your flight sheet, and in the config of each miner tell it which cards to use.