I want to delete a portion of cell contents that repeat throughout a single
column. For example: Row 1, Col 1 entry is "Phone: (888)000-000", Row 2, Col
1 entry is "Phone: (888)001-1112", etc. I want to delete only "Phone:" from
all the cells without deleting the rest of the cells' entries.

You could select all of the cells that you are interested in modifying the
search for €œPhone:€� and replace with nothing. Ctrl H brings up search and
replace.

Tom