Choose recovery disk question

Hello, my 2015 iMac came with 2 drives installed: 1TB HDD & 25GB SSD, with H Sierra on the HDD and recovery image on the SSD (was hidden).

I created a MDS workflow to upgrade it to Mojave plus some App pkgs and had the image hosted on the web server. Restoration seems successful but I found the Mojave was installed to the 25GB SSD rather the 1TB HDD so it ended up with a dual OS system.

How could we control this in workflow to force the new OS installation to one drive not other if more than one installed ?

Thanks !

When you run the MDS workflow, you select the volume to install it on. If you are having MDS select it automatically, there is an option to only select target with a specific name:


Thank you Tim, perfect answer !