Yeah. I get what you saying. I just did some tests. Yep, you are right it doesn't seems to list your module tables as a target, but it lists them as a source. Well here what you can try (do db back up first though):
- Get your class:
select classid, * from cms_class where classname like '%class_name_in_you_module%'
- Temporary set it as a custom table: update
cms_class set ClassIsCustomTable =1 where classid = ...
- Try the Kentico import toolkit (it does work for custom tables.)
- When done set ClassIsCustomTable to 0.
On the other hand there is SQL Server Import and Export Wizard which you can download and works fine with excel files.
P.S. Or your can do it directly from sql.