|What do you mean by "header"?|
Header as "Header & Footer" or Header as in "Column Header"?
...if it exists I want to keep it (do nothing) but remove the other similar headers.
PL_Position vs. PL Position
"Other similar headers" implies that there may be multiple headers to remove, yet you only gave one example.
I think we need some more details before we can offer any suggestions. Please keep in mind that we can't see your spreadsheet from where we're sitting, so you need to supply as much detail as possible about your layout, etc.
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