Excel question

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I'm pretty good with excel i think and have been using it to track my MTT play, but i've come up with two things that i can't figure out.

1) I keep running totals for ROI%, ITM% etc and i'd like to be able to graph them.. how would i go about graphing a collumn that will have data added to it? I don't want to have to edit the graph every time i add a tournament, but i can't just have it use the data from the whole collumn beceause then theres tons of empty cells it uses. Any ideas?

2) I use it to track myy TLB, what kind of function could i use to count just the biggest 20 (or 10 or 100) in a series?


Thanks

-Ray