QALoad does not have LoadRunner's nifty correlation functionality per se. So correlation is manual in QALoad. Look up parameterization in qaload.
In the Visual Navigator script, you can create rules for parameterization. You can also create an editable script and parameterize that by parsing out the desired values using built in functions and string manipulations.
If you convert with the visual navigator disabled, much of the parameterization is done automatically - but it does miss some. This version (c scripts) are going away in the next major release.