What computer operating system is involved with your Premiere Elements 14.
Assuming Windows 7, 8, 8.1, or 10 64 bit for now....
Hold down the Alt key of the computer main keyboard as you add a file to the existing Timeline structure.
The complexity of the task increases depending on the Timeline place where you want to add media and the structure of the existing Timeline structure.
Maneuvers for doing this develop as indicated. Some times it becomes necessary to group some clips before the addition to avoid unwanted Timeline changes.
Select all the clips for the grouping, right click anywhere in the selection, select Group in the pop up menu.
If any problems in the issue for this project, please consider posting a screenshot of the Timeline structure so that we can offer a customize reply.
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