Right
on your form, you can retrieve the date from the columns of the combo box by
myfield1 = comby.columns(1) etc
myfield2 = comby.columns(2)
put this in the after update event of the combo
the columns in a combo start with column 0, not column 1, and the column numbering reflects the declared columns whether you can see them or not. eg column(1) is the second column in the source query even if the column width is set to 0 and you can't see it.
I'm not sure what you mean by writing the data to a table. If your form is bound to the table - ie has the table as the record source, your values will automatically be saved in the bound table.