Hi @ayodyas, I’m not really sure what you mean by changing the constraint names? Do you want to add new constraints? Or delete constraint_1 and add constraint_2?
Is flow a variable and maxflow a constant? If so, you can use set_lower_bound and delete_upper_bound to add and remove different bounds.
Otherwise you can delete constraints:
p.s., You might want to take a read of Please read: make it easier to help you. It explains how to format your code, and it’s easier to help if you can provide a fully reproducible example.