We place holds according to Reg CC uniformly on all our savings and checking and business accounts. I know that Reg. CC is for consumer transaction accounts. Does it matter that we also hold checks on savings and business accounts? If we place an extend hold on the savings and business accounts do we still need to fill out an extended hold form?

Where did you get the idea that Regulation CC doesn't apply to business transaction accounts? It applies to all transaction accounts, and some states (such as mine, Massachusetts) extend its scope to include savings accounts and MMDAs.

OOPS you are correct about Business Transaction Accounts.