Need Animations Merged into single FBX

Need some model animations merged into single fbx. Each animation is currently a separate fbx model and many models need to use them. Instead, we need each model (fbx) to contain all the animations it will use. In other words, each fbx file will contain the model, and all the animations the model will use, and a list of keyframes (in a text file) so we know where to split animations in Unity. i uploaded 2 files shows the animations i have ,,, there is 15 monsters and 2 creatures share same animations