Excel 2003 - How do I set up a formula for the following:

I wish to have a running total of a $ amount brought forward in a column,
starting cell J3, followed by an additional amounts in G4+G5+G6-H7+G8
+G9-H10 etc. J4 would then show J3 plus G4 and so on with a final total
showing at J10.

I hope this makes sense.