New Sage Client, Business settings Control accounts and Categories

Suggested

Can't seem to get specific info in knowledge base. 

I will be importing my chart of accounts.

Can I create additional categories ? 

I cannot see the existing list of categories 

Control accounts ? Can / should I use a control account more than once? ( ledger accounts )

Is it better just to allow control accounts on those ledger accounts identified by the SAGE import chart of accounts format.

i do not want unnecessary restrictions

Small organizatioin, NPO

thanks 

Susan