To answer the question posed in the title "Do I Need Macros?", yes. Formulas can display results in the cell in which they are placed, formulas cannot make physical changes to the worksheet/workbook. Macros are required for that.
1) I've put some minor suggested corrections in the formula of OPEN sheet, columns R and T
2) I've changed the named range formulas on the LIST sheet, now you can freely add items to the lists in any column and the named range will dynamically expand itself for you without you needing to do anything special to insert. Just add the items in the next empty cell in any column, sort if you wish.
3) I've added a macro into the OPEN sheet tab module and the CLOSED sheet tab module. Right-click the sheet tab and select VIEW CODE to see/edit them.
OPEN sheet module:
CLOSED sheet module
It all seems to work as you described.
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