I'm still not clear on just what you wish to do, but it is possible to mix animations while blocking body parts to be included in the second animation. Have a look at the Motion Puppet panel section in the user manual and see if that helps you any.

Gerry

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System: Win 10 Pro (21H2), Asus X99-E WS, CPU i7-5930K -3,5 GHz, 32 GB DDR4 2666-16 RAM, NVidia GTX 1080 Ti GPU - 11 GB VRAM(Driver Studio-536.99), Samsung 850 Pro 512 GB SSD, 6 TB HD storage.

2nd Note: You Can Not Create two Motions in one. It's impossible. As far as I know, I have seen that Software out their. Unless you create a see thru image of 1 Video overlapping the original Video. if you can Overlap, It Makes a Great Video.

Yes, One Animation can be added one at a time. Use Timeline to Cut Animation where you need it to Finish off. Then at same "Point in Timeline" add your new Motion, And "Cut" to desired Animation in Timeline. This will "Not" Provide a smooth Animation from one to the other unless you create the Animation yourself using edit Motion/Actor/Moving hands, head, body parts. You can also try importing Actors/Props to very left or right side of Screen, Thus not Disturbing main Character. And Adjust. ( Drag and Drop Only ). yes you can do this, It takes a lot of Practice and time. Hope this helps..

I guess I wasn't clear enough in my problem. I need to place another motion  from frame 1 (and forward) onto existing motion and get two different motions working together at the same time and same place (avatar). 
Motion following motion is what I use all the time, but it is not what I ask here. But thanks anyway. 

When you add a motion to a character and wish to add a second one you need to open the Timeline and place the cursor at the end of the first one.



Next double click on the second motion, or drag it on to the character, and it will follow the first one as shown below.



You can do this for every additional motion that you want to add by making sure that you scrub to the end of the previously added one first.

Gerry

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System: Win 10 Pro (21H2), Asus X99-E WS, CPU i7-5930K -3,5 GHz, 32 GB DDR4 2666-16 RAM, NVidia GTX 1080 Ti GPU - 11 GB VRAM(Driver Studio-536.99), Samsung 850 Pro 512 GB SSD, 6 TB HD storage.

Hi, quick question -  is there any way I can merge animations (iMotions) drop down on avatar,  inside or outside Iclone at all, because every new animation file is deleting previous animation on timeline, so I don`t see the way to merge one above another, is it possible to do it? 
Thank you