In PE you just double click the bitmap and an "open" box will open. You then select the bitmap you want. This is a little tedious in PE.
Do a search for "Tonto" in this forum. Tonto is a ccf editing program like Pronto edit but it is much more freindly when it comes to graphics. you can down load it at
www.giantlaser.com under the tonto project.
Tonto allows you to have more than one ccf open at a time and you can cut and paste bitmaps from one ccf to another. Also when in tonto, when you are in the properties of a button, you just have to double click on the button bitmap to open all the bitmaps in that ccf.
good luck.