Yes, you can import down your match scores after they have been submitted to the league (ALTA & USTA). It is really quick and easy to import the scores down - here are the steps:
Go to the "Matches & Teams" in your TennisPoint account
Click on "enter scores" for a particular match
At the the top of the enter scores page you should see an "import scores" button - click it.
After the scores are imported down, review the data and then click submit at the bottom of the page
Looks like some sandbagging at line 5 there too