Question about blending animations

Let’s say I have several different “Idle” and “Run” animations BUT I want them to all have the same “Dash” animation. So even though it’ll look different when they run, when they use their Dash they will all blend into the same animation there. My question is how do i approach creating the dash animation to let it be blended into and out of several different animations?

For example, I’m assuming when creating this dash animation I shouldn’t use any of the idle or run poses as a “base” for the animation, or should I?

I would say not to use idle or run as a base and blend directly into the dash from idle/run. If it looks wrong you could try to blend or montage into a transitional animation depending on the need.