When you insert a floor the floor can can consist of the flooring material, floor sheathing and the floor joists. By editing a floor you can determine the thickness of the materials it has specified, if any and the framing materials, spans and directions. All of these options can be updated to reflect custom flooring needs. Now that the specifications are done the floor will act as one unit so you can update it and move it as required. If you need to move or edit individual joists than you can simply convert it to individual members. Select Insert-Members-Convert Framing to Members. Select a floor surface and it will instantly update the framing in that floor to individual members that can be moved and manipulated freely. I hope that makes your Envisioneer work, one step easier!