Hey, im not sure if I understand what you want correctly, but if you want to use the rigged skeleton of the mannequin you can find it among the files that come with the art tool. Do you have the pluggin installed in maya? If you do, go to the A.R.T.1.0 tab > add character for animation, select mannequin and click “add”, if you have everything set up correctly it should just load the rigged mannequin, If not it will tell you It cant find the mesh, if that happens you just click browse and find the file “mannequin_export” in this location \ARTv1\MayaTools\General\ART\Projects\Sample\ExportFiles (wherever you have the ARTv1 folder).