Is there a way to edit multiple wall sub-types from partition to exposed and vice-versa?

I am working with a series of drawings that I have imported from Hevacomp to EnergySimulator. In the transition many of the internal walls have been changed to exposed walls. I can easily change the sub-types but it's a slow process doing it for each individual wall section. I have tried selecting multiple surface to change at once, but I can't seem to select them. Is it possible to do this at the moment?

As a side note, after clicking a surface, it takes up to 5seconds for the properties box to pop-up, which feels incredibly slow (see attached video). Is this the same for everyone or an issue I'm having with my install?

Thanks,

Ralph