Steve .... Not sure whether you're chasing an animation or a pose as your final result.
● For just a pose, move your cursor to the 'sitting' position you want, right click your "selected" avatar and click "Remove Object Animation" from the menu.
● For animation,
move your cursor to the 'sitting' position you want, and right click at the cursor's position on the ('F3') time-line. (on the motion track). From the menu - click "break". Now you can delete the early section and then just left-click drag the remaining motion to the beginning of your time-line.
There's probably other ways to do it as well. :)
--------------------------------------------------------------------------------------------------------------------------------------------------------
Please be patient with me ..... I don't always 'get it' the first time 'round - not even the 2nd time! :( - yikes! ...
● MSI GT72VR Laptop, i7 7700HQ 4-Core 3.8 GHz 16GB RAM; Nvidia 1070, 8GB Vram ● iClone-7.93 ● 3DXChange Pipeline 7.81 ● CC-3 Pipeline 3.44 ● Live Face ● HeadShot ● Brekel Pro-Body ● Popcorn FX ● iRAY ● Kinect V2 ● DaVinci Resolve17 ● Mixcraft 8.1