Photo gallery - scene within scene?

I have very recently started using Flash CS3 and it is likely my question is simple - apologies if it has been raised before.

After building the basic shape of a photography business website in Flash, I am now trying to create dynamic photo galleries for several of the pages. My question is this:

Can I create a separate Scene for each gallery and then simply ‘import’ them to my current pages (as you would import a flash object into an html site)? Or should I build the galleries into my original Scene/timeline to begin with.

Any advice on this topic would be greatly appreciated. I hope the question is clear - as you can see I’m very new to this…

Many thanks