Another sample if it is just basic then your Inj File would look somehow like this .... ( No addons or sub morphs ) 

{

version

{

number ??

}

injectPMDFileMorphs :Runtime:Geometries:! My PMD:T-Others.pmd

}

Now you need to make a copy of the Inj file rename it to Rem and write it this way ... that is all the magic to it ....

{

version

{

number ??

}

removePMDFileMorphs :Runtime:Geometries:! My PMD:T-Others.pmd

}

After your change just save it and make your Tumb .... :) " remove is the magic word "

Note: Do not use compressed files in Poser this would make it difficult to alter the scripts ....