Using the Exclusion Zone editing tool you can designate a segment or more to be excluded from the video clip. So for example, if you have a 1min and 30-second clip and there is a 25-second segment near the beginning and another 30-second segment in the middle of the clip, you mark those "zones". When the clip is exported or shared to social media, the rendered video clip will exclude those segments. So instead of a 1:30 length clip, you now have a 35-seconds only clip of the specific content you wanted.
Please see our Feature Article on Exclusion Zones which provides a step by step guide on using Exclusion Zones (you can also search for 'Negative Edit' to find it)