I do this all the time and it's not much work at all. Usually takes me less than 5 minutes. (Note: doing this makes it very difficult to distribute the character afterwards and in most cases it will be illegal to share or sell this character.)

10 Easy steps for integrated clothing figures:

1. Load you figure and all of the clothes (keep hair and props out of the picture and load these onto your final character later).

2. Conform the clothes.

3. Open the Joint Editor, make sure one of the body parts of your base figure is selected and hit the "Zero figure" button.

4. Hide, or uncheck "Visible" on any body parts that are not important for the final figure.

5. Export as OBJ. Run through your Hierarchy editor to make sure the correct figures and body parts are exporting. Save somewhere inside Runtime:Geometries where you will be able to easily find it later. When the check boxes come up, only check the top box "use existing body part names."

6. [Optional] When you export multiple figures, Poser renames all of your material names with a :1, :2, :3, etc. at the end of the name depending on which original figure it came from. You can open the .OBJ up in Compose and delete the ":#" off the end of the material names.

7. Make a copy of your base figure's CR2 and open this up in a text editor or CR2Editor.

Find the two references to the .obj file and change these to point to your new .obj (if you find 3 references, congratulations! You have genitals! If you are working with a nude male, it's time to learn the CR2 format and delete all references to genital body part and the genitalSwitch function. This part gets a little hard, but once it's done, save a copy of that CR2 for future use.).

8. Open your new CR2 up in poser (it will take a little longer than usual to open the first time). If you skiped step 6, all your colors are going to be funky, and you just have to go into your Material Editor and set everything right. If you did step 6, you're base figure's colors are going to be fine, but you'll have to reset the colors for all of the clothes.

9. Open up your Joint Editor window and start bending/side-to-sideing/twisting your figure around. Anywhere where you see some funky distortions going on is because of Sphericle Falloff Zones. If you know how to fix these, great...if you don't know anything about them, uncheck them for that channel in the Joint Editor.

10. Save your figure to the character library and go from there.

These are all very easy steps (unless you're working with a nude male and the genitalSwitch gets in the way) and once you've gone through all the steps a couple of times, you can do this in a few minutes.

Hope this helps.