Hello A Stahl,
It is possible to import data from a sql file as a whole, and there isn’t an option to select certain tables to be imported as the sql statements in the sql file are executed as they appear in the file and it is not able to parse only certain statements from a sql file.
Mean while, you can execute the sql script into a database and then perform the sync with the existing database to import certain tables.
In the later imports, you can try backing up the database with “Scheduled Backups” with the option to create separate files for objects by selecting the option “Separate file for each object” under the title “How do you want to generate the script?” in the same dialog that enables you to create a sql backup file for individual table which would help you in the further stages while importing only certain tables into the database.