This may depend on the data you are trying to import. We have fields in the system called System Information Properties, which typically include activities inside of Uptics.
Currently, this information is not editable (or importable), as this is information tracked inside of our system.
Now, if there are some key pieces of information from another system you'd like to import, you can do so by creating a Custom Field and mapping the column from your import file to the Custom Field inside Uptics, and you'll be able to make Lists based on those properties if you need to do so.