In the File menu, select "Store semels".

If you want to create a new directory:

1. In the popup, navigate to the directory above where you want the new directory to be.
2. Click "New Folder".
3. In the "Name of new folder:" text field, enter the name of the directory you want to create.
4. Click "Create".
5. In the "Save As:" text field, enter the name of the file you want to create (with or without the ".tse" suffix).
6. Click "Save".

If you want to use an existing directory:

1. In the popup, navigate to the directory above the existing directory.
2. In the "Save As:" text field, enter the name of the file you want to create (with or without the ".tse" suffix).
3. Click "Save".