Lets fix the issue one by one. I'll split the ticket with your new questions. Lets fix the following issue first:
I am facing the issue regarding the display custom post FAQ answer, which is in relationship with FAQ ( FAQ - One to FAQ Answer - Many ) here ( FAQ also related to Product - One product to many FAQ ). Now, what I wanted to do is show the FAQ answer, which is related to the current FAQ in the view. Here view content is based on the FAQ that is related to the current product on the product detail page ( Template for Products D ). Now, when I try to use the heading block inside the view loop, I do not see any option showing the FAQ answer for the current FAQ. I want to show the title of the FAQ answer that is related to the current FAQ.
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So, the thing is that to display such post relationship we will require to use the nested views and you can not build nested views in block mode. To build nested view, you will require to use the legacy views.
I've created the following view that is used to display the FAQs belongs to product filter by post relationship:
Select posts in a Products FAQ relationship that are related to the Post where this View is shown.
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Then, I've created another view that is used to display the Answers belongs to FAQs and added the filter to filter by post relationship:
Select posts in a FAQs Answers Relationship relationship that are a related to the current post in the loop.
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Now, To display the related answers belongs to FAQ, I've added the view "answers-belongs-faq" within the "faq-belongs-product" view's loop editor:
<wpv-loop>
<li> [wpv-post-link] </li>
<div>[wpv-view name="answers-belongs-faq"]</div>
</wpv-loop>
Then on your content template ( Template for Products D ), I've added the view "faq-belongs-product" using the "Fields and Text" block at the bottom of the content template:
[wpv-view name="faq-belongs-product"]
Now, If I visit a single product that has faqs and answers configured, I can see it displays the related FAQs belongs to product and related answers belongs to FAQ at bottom of the page:
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Can you please confirm this works as expected and this is what you wanted.