Nintex Workflow for o365

Question

I am using Nintex for o365.

 

I am having 3 lists A,B,C with 3 forms A form, B form and the C form and now i am looking up some columns from A and B lists to C list and then created 100 items.

Now i am updating the columns in A and B and again creating the new items In C and so new items will be having the updated column values only.

 

But How to run a workflow on C for the existing and already created items in C ? is it possible to run a workflow every time whenever something gets changed in lists A and B.