How to add records in a custom 1:M relationship in Redwood?

Summary:

Hello,

For one of the requirements, we created a 1:M relationship between Opportunity and Account (One opty can have many accounts of a certain sub-type).

Adding records for this kind of relationship is pretty stratightforward in SUI — expose it as a subtab and you have the "Create" and "Add" buttons available automatically.

But can someone guide me on how to do this in Redwood? I surmise that we have to add a panel using the newly created child link of the relationship (/

crmRestApi/resources/11.13.18.05/opportunities/{OptyNumber}/child/Organization_OpportunityToAccountAM_Tgt). But I am unable to add such a relationship using REST.