Adding multiple slide masters to powerpoint presentation.

[mohito]

Hello,

I am using PowerPoint 2003. I have different slides in different
presentations. I want to combine several slides into one new
presentation.

using PowerPointCore = Microsoft.Office.Interop.PowerPoint;

....

PowerPointCore .Application pptApplication = new
PowerPointCore.Application();
PowerPointCore.Presentation pptPresentation =
pptApplication.Presentations.Add(MsoTriState.msoFalse);

Then I am having the file paths to all the other presentations I want
to take slides from and I am using

pptPresentation.Slides.InsertFromFile( ... )

Everything works fine, but having in mind that slides are from
different presentations, they have different styling and different
master slides. How can I copy the master files or I don't know what to
do and to apply them to the inserted slides, in order to look the way
they are looking into their original presentation, I am copying them
from?

Thanks in advance to all.