Thanks for all showing an interest in my problem, here are a few more details about what i was trying to achieve and how i eventually solved it.
I have a text file containing a list of major equipment on our site, the file contains a tag no for each bit of kit and approx 10 other fields with details such as equipment location, type of location etc. I opened the text file in excel such that each piece of equipment was stored on a new row. approx 8000 rows long x 10 columns.
My Problem. I want to filter such that i see only items from equipment locations A or B but i dont want to see any of equipment type C. The fact that i am interested in location A or B means that the autofilter couldnt accomplish this task without running two separate filters.
Solution. Using the Advanced filter.
I took me a while to get the syntax right for this and that was the purpose of my orignal question. To find equipment in location A that is not of type C I enter the following in the first row of the criteria range (that is the blank rows above my data i wish to filter) ...
In the location cloumn ="=LocationA" and on the same row in the type location ="<>TypeC"
and on the row immediately below I enter ="=LocationB" in the location col and ="<>TypeC" in the type column
Electricpete is correct when he states that my search will only remove data where the equipment type exactly matches TypeC and not merely contain this text, this can be overcome by the use of wildcard character, so if i wanted to remove all equipment where the equipment field contains the text TypeC I could use ="<>$TypeC$"
Thanks again for all showing an interest and i hope this exlpanation is of some use to others trying use the advanced filter facility