animation picks up where other animation left off

I am working on a 2d top down game and i have two attack animation blend trees
one for idle and one for walking animation. i want to be able to transition between idle attack and walking attack and have the animation picks up where the other left off. is there anyway to do this.

for example: if i am half way through my idle attack animation and hit the walk forward button i want to transition to the walking attack animation and have it start at the half way point.

hope i explained myself clearly thanks to anyone who can help