I am working with a sheet that contains on average 100 items. Next to
each record I would like to place a checkbox.

Therefore, how do I:
1. Assign that checkbox to that particular row (as it looks like the
checkbox is floating on the sheet and not assigned to a cell), so that
when that checkbox is selected it identifies that the information in
that active row needs to be selected

2. When the checkbox is unchecked for the row to be returned to its
original state (i.e. is there a statement such as checkbox = false
then ... )

any help greatly appreciated as my knowledge of using checkboxes is
very limited.