Default table cell strokes

Hi all! I created a bunch of reports in InDesign. Each page has a table on it. Fast forward several months... I've been asked to update these tables with a total at the bottom of each table. No problem. I add the new bottom row to a table. But then I want a stroke between all the cells above this bottom line. I know how to do this. But what's annoying is that the little area where I am to click which stroke I want to modify keeps defaulting back to the outer strokes of the the table (see attached). It doesn't remember that I want only the interior horizontal line to be stroked... 

Is there a way to make it remember this is what I want? Can I make a style? 

Thanks!