Banking Transaction For and what transactions

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Hi everyone.

I recently started using sage because My QuickBooks stopped working.

I am currently going through my past transactions and I am Trying to organize the transactions and i am having a difficult time with the categorization. 

My problem is with the pre-set transactions Category's. for example if I wanted to organize a charge for a system process there are no options for it other than something like "office supplies" or "Other office Supplies:

My question is simply how do i Create my own "What" Charges 

Thanks yell