I have a mocap data and I want to remove the animation from only the legs of the character. How do I do this?

In the timeline, right-click the motion clip and select Remove Motion, then, one-by-one, select the body parts you want to remove the motion of. So, L Leg and R Leg in your case.

https://manual.reallusion.com/iClone-8/Content/ENU/8.0/51-Animation-Timeline-Editing/Removing_Motions_of_Body_Parts.htm.

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Thank you, do you know if I can get the legs back to the default pose for begin the animation on that part?

You should be able to that using the Motion Editor.

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I have been having a real problem with just this today. If I remove motion from left arm it twists and changes position. Also it takes where I clicked on the timeline as the point I want to remove from yet if I try from frame one it skips to frame four, twists the arm and moves it down and then the motion continues to how it was before. Annoying as I used it the other day without issue.

Hi! I have been looking for removing motions from body parts but no one has answered as yet. i have animator 4. 5. not iclone, but i tried  your advice.
yes! thankyou so much it works for animator 4.5, you are such a good help best regards vicki