Can you have a mainform with a combobox that lists field names from a table, change the RowSource for a textbox in a subform.
Table 1 Table2
NameofFields Mo Ni Mn
Mo
Ni
Mn
Main
combobox > Mo <
Ni
Mn
-------------------
Sub
Textbox >> RowSource = Value of MainForm Combobox <<
Willie
Table 1 Table2
NameofFields Mo Ni Mn
Mo
Ni
Mn
Main
combobox > Mo <
Ni
Mn
-------------------
Sub
Textbox >> RowSource = Value of MainForm Combobox <<
Willie