Hi @Ivoramore1934,
A warm welcome to the Bunnings Workshop community and thank you for your question.
I imagine your Body Corporate Manager would be the best person to contact for a remote control for your garage doors.
If they don't prove helpful, there are a variety of garage door remotes available, but we would need to see the old remote and the model of the garage door motor to recommend a suitable replacement.
Let me know how you go with finding these details. I am happy to help if required.
Jacob
