Are you looking for the Heat Development Projects and Heat Development Packages?
They can be found at the bottom of the Build menu in the Configure Application interface
ther is a bit more under "Using teh HEAT Development Package" in the Admin Help. Generally all changes are logged under the Project "Default". Each Save generates a Transaction Detail:
These can be structured in Projects. These are assembled to Packages and that is what you can push between tenannts:
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The HEAT Development Package functionnality is what you're looking for as said mbath61 and martin_kasper.
But I believe you have to contact your vendor to activate it for SaaS (Or you can activate it yourself if you're On Prem)