If I have several terms I am searching for such as:
john OR frank OR mary OR jim OR jeff
How would I then create a chart of the sum or percentage of each search term, such as john returns 20 of 100 total results and is therefore 20% of the pie chart...
If you create a field that contains those names, you can just use the top command:
john OR frank OR mary OR jim OR jeff | top name
Field extractions can be predefined or done on the fly. Resource for field extraction: http://docs.splunk.com/Documentation/Splunk/latest/User/ExtractNewFields
Resource for top command: