I just import the obj file and scale it to suit the figure. Most things dont need to be measured. Once its scaled export the obj and re-import. It will now be the correct size at scale 100%.

For ptops just save to the prop library preferably in a folder named for example

runtime/libraries/prop/vendor/product  then check the obj file is in eunrime/geometries/vendor    and see that the prop file is pointing to it. (poser tends to create a new obj file or embed the obj in the prop file.

Same for a figure but do the tigging. For simple machines you can use phibuilder and just edit the figure poser creates from the phi file.

 

Poser 5 will do anything you need to do.