You have several options to do that:
1. Author a  SetProperty
<http://wixtoolset.org/documentation/manual/v3/xsd/wix/setproperty.html>  
element that will append the string entered by the user
2. Author a  Publish
<http://wixtoolset.org/documentation/manual/v3/xsd/wix/publish.html>  
element on the dialog's "Next" button (the dialog where the user enters the
value).

For costing to function properly make sure that the initial value for that
directory is in the same volume. So the initial value should be "c:\program
files\company\" and you'll only append the last part on SetProperty /
Publish elements.






-----
- Nir Bar
Freelance Developer.
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