Before the update, if you need to move a flow from no/one number to another, you will need to publish the old flow to be a template then install it to the new numbers. In that way, bot users in the old flow are not moved to the new number. Only the flow is moved.

Now you can easily switch flow between numbers, all bot users are moved together with the flow and settings.

Simply, click on the unlink button to disconnect the flow with the number and click on link button, then choose a standalone flow to link the flow with the number: