Deleting BPM.. from a step chart

[PRiNCE4LiFE]

Is it possible to get rid of the little bpm changes in a existing step chart.. and make the whole step chart something like 300 bpm.. but still be able to keep the steps themselves.. if so how do you do it? thanks :)

[trumaestro]

Open the .sm file with Notepad. In the #BPMS: line, delete everything except #BPMS: Now type in 0.000=300.000; next to #BPMS: Make sure there are no spaces. You need the semicolon; don't forget it. Save it.
You can change 300.000 to anything you need, as long as there are three digits after the decimal.

If you're in the editor, go ESC -> Reload from disk -> Yes in order to see your changes.