Purview Glossary Template - Custom template selection always includes default template attributes

I created a glossary. for the glossary term, I create a new custom template in purview. I also create a few attributes in it. I have a csv file with details for these attributes. 

When I try to upload the csv the default template is selected by default and the selection includes all default template attributes. is this the default behavior or can i select just the custom template and its attributes. do I have to have a csv that has the default template attributes along with the custom template attributes that i created ? 

the picture below shows both selected, i am not able to unselect or deselect the default template. 

Hope my description makes sense. can someone shed some light and provide any documentation.