3 NPC characters moving together with the same direction or in the same blendspace

I’m working on animation of three characters, one is a injured NPC, and the other two pick up the first NPC. I have animation for the each NPC one picks up from the head and the other pick ups from the feet. Now, when they start to walk I want to create a blend space that allows the to move together, left, right, and backwards. This would be like a normal single character blend space with three characters. Is there something where a can combine the three different animation for three different character?