Need some help with "ascending" text filling multiple cells

[tekeetakshak]

Hello, I'm new to these boards. I have a fairly lengthy project that involves something I am unfamiliar with in Excel.

http://i.imgur.com/1Wylp.png

Basically, every time I see "testtrial" I have to increase the t### value by one. But I also need to keep the value the same within each testtrial. Is there an easier way to do this besides typing every one out?