I have been in supervision since graduation. I have never performed a single calculation. I have never designed anything myself, but I have checked the work of others. If you have been checking the work of others, you have been doing engineering. However, this basically requires you to recalculate the design.
Most engineers spend a portion of our time doing nonengineering work.
Don't try to hide or misrepresent your nontechnical work. If it is substantial, you can assign a percentage to your experience, and that will be accepted by the state. There certainly are exceptions, but the state board is going to wonder how you could be doing engineering work without the benefit of an engineering education. The work experience does not have to be in the United States. However, it is more difficult to document such experience.