I am writing up some notes and enter formulas (integrals, products, PDFs, ...) in Input cells to get the formatted result in the Output cell. When I restyle the output cell as a DisplayFormula the cell loses its connection to the Input cell. That is it does not collapse with the Input cell and reevaluating the Input cell creates a new Output cell instead of updating the DisplayFormula cell.
How can I keep the DisplayFormula connected to its Input cell? I would like for it to behave as the Output cell but with the DisplayFormula styling. I'm not too savvy with style sheet editing but would like a stylesheet based solution so that I can easily apply the it to new and existing notebooks.