how to remove license file from Rational license key administrator

I am not an expert in the use of the Rational License Key Administrator so I don't know how to remove a license file. Also I am not sure I fully understand what you mean. When you import a license file, there are a certain number of licenses assigned to each license feature you requested. From your post I am assuming you had a separate file for each license feature... one for Enterprise edition publisher authorized user and one file for Enterprise edition publisher floating... is that correct? Is what you want is to remove the licenses for one of these features? Please clarify.

>also need to know how to configure RAM to LDAP
There is lots of information in the RAM info center to help with setting up RAM to work with LDAP. Here are a couple of links to get you started:
Deploying and configuring application files by using the server setup application  - scroll down to step 17
Configuring for LDAP integration