It's not possible to create contract templates on Indy at this time but this feature is on our radar. If you would to stay up-to-date on when this feature is released, let us know here.
In the meantime, we recommend you create a base contract that can be duplicated with each new client or project. Then make the necessary edits before sending it. You can duplicate a contract by clicking the 3-dot menu next to it and selecting duplicate.