This is coming from a Gief/Hawk player, but to set up a command grab, you know the opponent is going to come into the fight fearing the grabs, so they’re gonna run away and bunny hop.
Step 1. Teach 'em to stay on the ground.
A simplistic example (with some holes in it, but it’ll work for now) is to stand over someone on wakeup. They’re probably going to jump away. So instead of grabbing on wakeup, stick out a normal like Gief’s standing HK that’ll catch them out of the air. Or, alternatively, a meaty combo.
Awesome, now they’re afraid to jump on wakeup, because grappler’s heavy normals usually hurt.
Step 2. Remind them why they used to jump.
Once they’re conditioned to fear your poke, give 'em a hug.
It’s not a fullproof system, and is very much dependent on Yomi, but if you can read your opponent well it’s a good way to put a hurtin on them fast.
Of course, against newbies and scrubs, there’s a Step 0: teach them to fear your grab in the first place. If they never get past that point, SPD, approach, rinse and repeat until victory.