SAGE Accounting - imported my chart of accounts successfully

I need a feature to add up specific group of gl accounts. Existing categories do not cover this & additional categories cannot be created.

Same concept for balance sheet and income statement reporting.

Example - I have 5 GL accounts for different expenses, office related. I want a report to always include them together with a total 

Office & Administration   ( this would be the total of the GL accounts listed below) - I created this GL accoung

Office Rent

Postage 

Telephone 

 Internet 

Supplies  

I have several of these "groups" to manage

Marketing Expense Group

Grant Revenue Group