You can do that with the SUMIF function.  Assuming that Column B holds the
categories, and Column A holds the values, then the formula would look like
this if you wanted the sum of all values in the Internet category:

=SUMIF(B1:B7,"Internet",A1:A7)

You would, of course, include all of the cells in your range, not just the
first seven rows.

Steph

Just the thing for SUMIF
=SUMIF(B1:B4,"Internet",A1:A4)

Or put the text "Internet" (sans quotes, of course) in D1, and the other
categories in D2.....
In E1 enter =SUMIF($B$1:$B$4,D1,$A$1:$A$4)
Copy down the column

If you have many categories, look in Help to learn about Pivot Tables and
then come back with more questions
best wishes

This might be a good time to learn a bit about Pivot Tables (if you haven't
already used them)

You'll need column titles:
Examples:
A1: TimeSpent
B1: Category

<Data><Pivot Table>
Use: Excel
Select your data
Click the [Layout] button

ROW: Drag the Category field here
DATA: Drag the TimeSpent field here
If it doesn't list as Sum of TimeSpent...dbl-click it and set it to Sum
Click [OK]
Select where you want the Pivot Table...and you're done!

That will list each Category and the Sum of TimeSpent.

To refresh the Pivot Table, just right click it and select Refresh Data

Is that something you can work with?
***********
Regards,
Ron

XL2002, WinXP