You may have certain features that are very similar or the same geometry as a feature you have created before. Or a feature that you mapped on mobile. The ability to copy these features allows you to get the same geometry without having to do the hard work twice!
Go to your survey with the geometry and add or edit a survey.
Fill out necessary details in your form and when you get to the geometry, select "Copy from Polygon/Line/Point"
A dropdown menu will appear. You can select straight from the dropdown menu or type in the GIS feature you are searching for.
After you select the feature, the geometry will copy and you can save or edit it as you please!
