Hi Andrea, if you are looking to enter a Capital asset (like machinery or equipment), it would be C+, however, depending on the type of asset you are needing to enter, A+ is also the right choice, and if the account you need is not there, then it may need to be added to your Chart of accounts (Under the Setup menu). If you can give us more specifics on your transaction, we can better advise you on which way to proceed.
