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There's no easy way.
The way I've done it in the past, is to make radio edits but you have to look at the track on a macro level.
This means looking at the sections and numbers of bars and reducing them in proportion. So if the intro is 16 bars, then you cut it down to 8. But then you'll need to cut the other sections within that so it's not as easy as just cutting the intro in half as you may have things like ascending pads or progressively layered elements that will no longer make sense in comparison to the other sections.
In other words you may have to split those 16 bars in to 8 sections, then cut each of those in half, to make a shorter progression that is only 8 bars long.
Even then, the progression may not work depending on the content. I've done it a few times with tracks that were both too long and too short and got generally good results but it's a much more complex task that you first think and requires deal of understanding in song structure to not make it sounds crap or like an obvious edit.
from a technical standpoint, the main thing is that your cuts HAVE to be sample accurate so you're cutting exactly where each bar or beat begins/ends. You get that wrong and the track won't hold BPM.
Good luck!
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