How do I enable the merge/inheritance on Creo 5.0.6.0

I am using Creo Parametric Release 6.0 and Datecode6.0.0.0

I am trying to load the merge command/inheritance feature.
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License Information
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Release: 5.0
Version: 5.0.6.0
Creo Parametric Platform Agent Version: 4.17.0
License Name: PROE_FoundationAdv
License Version: 29.0
License Type: Commercial version, Floating License

Let me know if you have additional questions or need additional information.

Here are the errors that I faced
It is grayed out in my version of Creo 5.0