So, inorder to create there has to be a will .The willpower is from Maa Tripura sundari devi. This is Ichcha shakti.
Next comes Gyan shakti which comes from Bhuvaneshvari devi.Gyan shakti makes will power further strong
In order to get rid of all problems in creation,Tripura bhairavi devi exists and she destroys all hurdles in creation,which is Kriya shakti. She is an aspect of Aadhya kali.
Thus they form three aspects in creative part of nature.These Mahavidyas are engaged in creation