The 'My Lists' feature in the Keyword section of the Web App is a great place to keep all of your keyword data organized, up to date and optimized.
Within the 'My Lists' section you have the ability to add keywords from Keyword Scout as well as import your own lists that you have been keeping elsewhere (like in a spreadsheet or document).
You can even combine suggested keywords from Keyword Scout with existing keywords lists you have.
To import your own list of keywords to 'My Lists' select the hamburger icon on the tab you wish to add keywords to:
Then select 'Import List' which will bring up this pop up:
Now you can copy and paste in your keywords from your external source and click 'Add to List'.
Each keyword must be on its own line for the import to work.
If you would like to export or delete a list of keywords from 'My Lists' follow the same process as above but instead choose 'Export List' or 'Delete List' from the menu.