>>7630469assuming you're talking about the 2.0 figures (female templar, Jjuno, etc) yes, you can do exactly what you describe. The torso can be removed from the legs at the waist (the metal piece at the waist marks the seam, you can just pull them apart if you pull firmly)
The arms can be removed at the shoulder from the torsos. You may want to heat it up a bit before doing this, but it should work fine regardless.
Pretty much any articulation point on Mythic Legions figures is a perfectly legitimate place to take them apart at and swap parts, but heating them up is best on some parts. They are designed to be modular, both for the creators to use parts for different characters, and for fans to make their own customized characters. Some figues (like the build-your-own knight packs) are basically designed to be used like that. Here are some examples of using legion-builders mixed with parts from the build-your-own knight to make a variety of interesting knights