Tagging different sets of standards

I doesn't seem like I can tag standards from different sets on a column. 
So I have my main subject standards, but I also have lists of standards for the Literacy and numeracy frameworks that are mandatory in Wales.
it'd be nice to tag standards from those frameworks on columns along with my Main subjects standards. Is there a way of doing that?
When i change the standards at the bottom of a column, it loses the link to any previously added standards from a different set of standards.

So basically, I want to add standards from multiple sets on a single column.