What version of Premiere Elements and what computer operating system involved?
First you need to get the analog footage from the tapes and digitize it? Have you done that yet? If so, what files do you have DV AVI standard files?
VHS (analog) to Digitalized file Digitizing Family Movies - Transfer Videotapes to DVD
a. Use DVD/VCR recorder to record the VCR tape content to DVD-VIDEO on DVD disc
b. Connect VCR to computer with firewire connection, using a capture program like Premiere Elements 12/12.1 and earlier (latest versions of Premiere Elements 13/13.1 and 14/14.1 no longer have this feature.
If the plan is to import these files in different Premiere Elements projects and combine later, keep in mind you cannot import one Premiere Elements project file into another. If you have Windows, two choices
a. export the Timeline of project 1 to file saved to the computer hard drive and then import that export into project 2 or the grand project that will do the final export.
b. use ClipMate in conjunction with Premiere Elements for a copy/paste insert between Premiere Elements products.
Please consider and give more details. Any questions or need clarification on the above, please do not hesitate to ask.