You can import into Uniden SS software. Lately (by someone else advice here) I started exporting data from my scanners and collecting all frequencies from other sources into spreadsheet format. Description on the left column, frequencies on the right, then CTCSS if any. Then it is easy to import into SS software anything you want. By cut and paste from spreadsheet into SS software by column, description first then frequencies, bingo. It also apply to Whistler TRX-1 or 396XT for importing, so one database do it all.
Best if you export all your existing frequencies into .CSV format first then tidy everything up and start adding from other sources
Some initial hard work to be done but after is a breeze to import what you want. Now when I am off traveling I just copy and paste local airports,
transit airports and destination airport and any known analog destination frequencies into Uniden 126 AT software, overseas profile.
When I come back I just revert to my standard local profile. Good luck.