Edit - this video is very old and the menu/options for dforce changed quite a bit. You will get the general gist of how to do weightmaps but keep in mind that the menus will look different.
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This is a quick walkthrough on how to set up items with non connected mesh for simulation in dforce. Its from a slightly older version of dforce but the principle is the same. :) Note: - select Add dForce modifier : Dynamic Surface when you add dForce to a new garment

You will need to be familiar with basic Daz Studio navigation and commands, there are plenty of beginner tutorials out there so I am not covering those features in these videos.