How to change master slide to existing template in Impress
 

Hello all,

I am having some issues working out how to gett OpenOffice impress to change the master slide of an existing presentation. I have a template, saved as a .sci that I want to apply, but I can only work out how to apply it to a new presentation, not one that already exists.
I am using OpenOffice 1.1.1 (It comes standard with FC2).

Thanks in advance,