The formula structure is the same as in Excel, so you could use:

=ADGET("GLDATA.Y","6010")+ 24

Or, if the amount to be added were in a certain cell, say C5, and were to be used throughout the sheet:

=ADGET("GLDATA.Y","6010") + $C$5

Just make sure that if you are adding to a revenue account, you get the sign correct (Revenues are credits, therefore are multiplied by -1 in the spreadsheet to show as positive numbers.)