If you have a text file with the dump for ALL of the databases i do not believe there is a way to tell mysql not to import specific tables (that is, without restructuring the create/insert statements).
I would just separate the file into smaller files (assuming you're on linux/bsd/etc).
grep for the start of the create database statement for the one you want, then grep for the start of the next one, take those two line numbers and use head/tail (or something similar) to separate them out and put them into a new file, then import it.