For a CTR filed on a business do you list cash in/out on the individual you would mark box 2b for? Or just cash in/out for the business?

If you're asking about line 21 & 22, list the amount of cash each individual deposited or withdrew whether on their own behalf or on behalf of another.

Example:

John deposited $6,000 to the account of ABC Inc.
Jane deposited $5,000 to the account of ABC Inc.

3 Part I's

ABC Inc. (2c) List $11,000 on line 21
John (2b) List $6,000 on line 21
Jane (2b) List $5,000 on line 21