I have simple userform with one multiline textbox and 6 checkboxes. My
problem is how to make that checking a checkbox will copy the textbox
value
to a new line without deleting the upper line. I tried various things but
I
cant avoid the deletion of the upper line (especialy in the case of more
then
one checked checkbox).

Copy the "textbox value" to a new line? Where is this new line going?

Did you, perhaps, mean to type "copy the CheckBox Caption property to the
bottom of the TextBox? If not, I think you will need to clarify what is
being copied and to where.

Rick