It is easy to isolate a single downline branch and use it to create a brand new PAF file.
Create a GEDCOM (Tool Bar, click on the little floppy disk icon with the arrow going out of it).On the Export Dialogue screen, select "Partial" (near the bottom, in the section entitled "Selected Individuals;"then click on "Select" (just to the right).
You are now presented with the normal alphabetical index of your file.Select the ancestor whose downline branch you want and select "Descendants." You will see a little sub-window -- how many generations do you want? (99 is the default), and do you want to include spouses? (check the box YES is the default).
Click "OK" (bottom-left button).You will see the Export Dialogue screen again -- On the right you can choose what you want included (all boxes checked is the default).
Click "Export" (bottom-left button).You will be asked to give your new GEDCOM file a name, and to specify the folder where you want it.
Once you've exported your GEDCOM, you can open it this way: Open PAF, and close (X) your primary file.Then open your new GEDCOM by selecting "Open" from the FILE Menu; select File Type "GEDCOM" and specify the file folder location.You will get a little window saying that you have to create a new PAF file, so you click "OK" and fill-in-the-blanks and follow the instructions.
Your new PAF file will be an exact duplicate of the desired downline branch of your old PAF file, except that it won't include the parents of the descendants' spouses.This is just a little shortcoming of the way PAF creates GEDCOMS.
The reason I use Family Tree Maker as a utility program, is that I can create an outline descendant chart that includes the descendants' spouses' parents.I print the chart out, and use it to select the spouses' parents (Ancestors, 2 generations; 0 descendant generations) when I create my GEDCOM of the downline branch.
Hope this helps?
-- Cliff in Virginia William C. Barney President, Barney Family Historical Assn.