If you have recorded your animations directly in the motion capture software you are using, or have downloaded a pack of animations as fbx files, these are steps necessary to make them compatible with the impulse tool. This will be easiest to do when starting with one of the Impulse sample projects that includes a selection of starter dance animations.
This video covers steps 1-4 for a fast retarget, but if you aren’t satisfied with the result, going the long way and tweaking your own retargeter asset will help you get better results
NEW How to Retarget Animations with ONE CLICK in Unreal Engie 5.4 Preview
1- import your fbx animations, including the skeletal mesh they were created with
2- create an ik rig asset for your imported skeleton, and use the buttons at the top of the IkRig editor window to set up a solver and goals for the hands and feet

3- create a retargeting asset that acts as bridge for mapping between two different skeletons using their ik rigs. Your mesh you imported with the fbx is the source, and our impulse character skeleton is the target.

4- retarget the animations you imported onto the impulse avatar by selecting one of them, right click, and choose retarget. then a new window pops up where you can select the retargetter you just made, and then below that the list on animations you want to retarget


5- duplicate one of the dance level sequence assets that comes with Impulse sample project, name it something representative of animation you want to set up first.
6- Open your new duplicate level sequence, make sure the sequence is unlocked, then right click on the animation track of the skeletal mesh in the level sequence, select the properties option, then select the animation option, and pick your newly retargeted animation


7- Save your level sequence, and repeat steps 5 and 6 for each other animation your retargeted to use with Impulse!