help with multiline textbox and manipulating text sting

i have a textboz called tb1 which shows the values of five cells combined. those cells have procedures listed in them which a person has to do . those procedures in the cell are separated by and enter. to make it simple a cell can contain-

idnetify customer
verify customer
concern
resolve
anything else


so this is one procedure listen in one cell call a1. when i activate the userform it shows me the value of that cell on the tb1 ( multiline so different procedures in different lines) .

what i want is a way to be able to do this: when a user puts "#" in whatever line number (which means he completed that procedure), i want that line deleted from that textbox.



also: but the previous condition that i put that tb1 shows the value of the five cells kind of creates a problem. so what i want is that when that line deletes from tb1, it also removes it from those cells, so that it doesnt keep coming ack.