I'm sure if you ask for the timber department you will find a team member that can assist you.
Alternatively, I am confident there are Workshop members here in this community that will be happy to assist. You might just want to tell us a little more about the design you are planning. We have lots of experienced and knowledgeable members in the community who are happy to help as much as they can.
Thanks for joining us, and we look forward to reading more about this project and many others to come in the future.
As far as I am aware, and I am not being facetious here, Bunnings seem to have put a ban on tongue and groove anything,the one exception might be that chip board flooring sheet I suppose. Tongue and groove timber is one of those products that used to be ubiquitous but has become as scarce as hens teeth unless you go to a flooring company and pay top dollar,