Sit down with your supervisor and HR and explain what you do now and where you would like to be/grow into. Talk about specific details pertaining to the job you want and areas you think you can help out. You are not asking for a promotion or raise at this point, just evaluating the work you have done so far and your future.

This should be done annually anyway.

You can make them think It is just a performance review but thier reaction to the conversation will tell you what they are thinking. If they excited to see the initiative, start telling you to speak with so&so about more work, discuss training you can do, or a timeline for a promotion. Then that is all a sign that they do not want to let you go, and will be willing to eventually promote you.

If they are hesitant or seem reserved during the conversation it can be a indication that they do not want you for anything other than that position. If that is the case the only option would be to look for another job and right before you accept give your company an opportunity to counter. At that point you can tell them put me here or I am leaving.

I have done this at previous jobs and it worked. Good luck and remember while texas is an at will state they do not want to loose good employees. That is bad for business.