Assuming the columns are dynamic you'll want to use foreach
:
... | rename "count(CMDB SERVER)" as cmdb | foreach count* [eval <<FIELD>> = '<<FIELD>>' / cmdb] | rename cmdb as "count(CMDB SERVER)"
You can use the eval command to create a new columns or modify the values of the current columns (documentation here: http://docs.splunk.com/Documentation/Splunk/6.2.0/SearchReference/eval)
Renaming your columns will make the eval strings a bit neater, for example..
... | rename "count(CMDB Server" as "CMDB_Server", "count(CMDB APP)" as "CMDB_App" | eval CMDB_App = CMDB_App/CMDB_Server