Currently, it is not possible to display linked issues in the customer portal natively. There's an open feature request for that, which you can watch and vote.
I work at Valiantys Software, and we have an alternative solution with our app Exocet. It can allow you to display your linked issues on the customer portal in a data panel as show below:
See this tutorial for reference, it explains how to set Exocet up for this.
To sync comments, you can also use Exocet as presented in this tutorial.
This is not a native solution, but I hope this will help you provide your customers with visibility on linked issues.
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