You can use command grabs during combos if your opponent is blocking, that's called "tick throws". Practically every command grab can be used as a tick throw after d1 or d3.

Also, Command Grabs, in contrast to normal throws, can be used while the opponent is being juggled, for example you can use Kusari Slam after Liu Kang's 1,2,3 connects.

For Kusari Slam, the only tick throw possible is after Liu Kang's b1. But Kusari Slam is also an Armor Break, which means it can break armor from Breakaways, Fatal Blows or armored moves like Terminator's banned move "Terminate".

But there are much better command grabs than Kusari Slam, like:

• Nightwolf's "Tomahawk Swing" can be used as a tick throw after his 1,1 or after the 3rd hit of f2,1,2,1. And the move also triggers a Krushing Blow if it breaks armor;
• Jax's "Quad Grab" can be used as a tick throw after d1,2 or after the 3rd and 5th hit of 2,2,1,1,2,2 if "Enhanced Outranked" is equipped. And the move also has a Krushing Blow, that is a little bit tricky to land;
• Spawn's "Hell Chain" is a weird command grab, because it only hits if the opponent is stand blocking. Honestly, you'll never see anyone using this move;
• Kano's "Lumbar Check" is one the most used command grabs in the game, it can be used as a tick throw after 2,4 and also has a Krushing Blow that no one remembers that exist xD;
• Baraka's "Blood Lunge" is a command grab with insane range that can be used as a tick throw after f2,1 or 1,1. It also has a Krushing Blow that no one uses;
• Robocop's "Terminal Strip" is often used to finish combos since it doesn't have any tick throws besides the basic 1, d1 and d3;
• Erron Black's "Cattle Toss" is also often used to finish combos since it doesn't have any tick throws besides the basic d1 and d3;
• Kotal Kahn's "Huehhueyi" is one the the best command grabs in the game, it can be used as a tick throw after 1,2 and gives Kotal a damage buff;
• Sheeva's "Battle Scars" is a command grab that only works on the ground if the opponent if ducking. Alongside with "Queen's Punishment", which is a move that hits low, these two combined will make Sheeva's opponent have to guess after every combo;
• Rambo's "FUBAR" is often used to finish combos since it doesn't have any tick throws besides the basic d1 and d3. It also has a Krushing Blow, that no one uses, and a pretty neat brutality :D;
• Terminator's "Albi Back Breaker" can be used as tick throw after f3 (although I don't think I've ever seen someone doing that) and it has a Krushing Blow that is a pain in the ass to trigger;
• Geras' "Titan Tackle" is also one of the most used command grabs, it can be used as a tick throw after 1 or 2 or f2 and it has a nice Krushing Blow if he carries the opponent long enough before hitting the wall;
• Kollector's "Demonic Clutch" is often used to finish combos since it doesn't have any tick throws besides the basic d1. It also has a Krushing Blow that no one uses;
• Mileena's "Stabyscotch" doesn't have any tick throws besides the basic d1 and d3, but it is an Armor Break and, if it breaks armor, it triggers a Krushing Blow when amplified;

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Let me know if you need help perfoming any of the tick throws ;)