Toursoft allows you to import contacts as list files. Here's how.
First, go to the Contacts tab
Then, select "Import list"
Select "Upload a CSV/XLS"
Now, select the contact list file you'd like to import in your file browser and open it
Your contacts are now added!
Note: This can be done as many times as needed. If you want to add contact information, you can do so from the Contacts tab and selecting "Edit contact"