too many inherited custom headers

[JR]

It seems that somehow I have "inherited" custom headers
and footers from someone else's workbook. They have
filled up almost all the allocated spaces in the drop-down
selection list and pre-empt me from adding more than two
custom headers/footers of my own. I need to add at least
four new custom headers to the list.

Is there some way to delete all the "inherited" custom
headers and footers?

Thanks,
JR