Hi Shields,
Let me clarify some FM terms, so we are talking about the same things... There is a portfolio file. This is a file saved with the extension of .mm4, and it contains your whole workspace. It saves which sub-portfolios you have, and what investments belong in each sub-portfolio. It also saves all your preferences, what windows you have open, etc.
There is always at least 1 sub-portfolio open. You can have more, but you have to have 1. The default name for this top level sub-portfolio is called "Master Portfolio". You can have as many sub-portfolios as you want, with as much hierarchy as you want.
Generally, you will only want to have 1 portfolio file (*.mm4), and as many sub-portfolios as you want, to track all your accounts/holdings.
When you import, you can select any sub-portfolio as a destination. You cannot select a different portfolio file (*.mm4) as a destination. In your case, if you set up your 5 sub-portfolios before you do the import, then you can choose from them when you do the import.
For some more background, and a tutorial on working with multiple portfolio files and sub-portfolios, you might check out the Portfolio Editor tutorial:
http://www.fundmanagersoftware.com/tuto ... video.html