Importing or referencing data in analytics.

To do our sales tax calculations we have to bring Lightspeed, Etsy, and Peek data together. Can I import that data in to looker (analytics) and run a custom report in Analytics? Thanks much.
To do our sales tax calculations we have to bring Lightspeed, Etsy, and Peek data together. Can I import that data in to looker (analytics) and run a custom report in Analytics? Thanks much.