Automatic filling of the "Parent" field when creating

[mr2d2]

Hello to all!
How to find the code that automatically attaches one object to another(Automatic filling of the "Parent" field when creating)
Example:
I create a new object from "Opportunity". When creating an object from which I create, it will be reflected in the "Parent" field.
How can I make the "Opportunity*" field work like this?

[tanya]

Hello
start digging from client/src/views/record/panels/relationship.php, if you created it from relationship panel

[mr2d2]

I have only js files.
Maybe client/src/views/record/panels/relationship.js?

[tanya]

yes, of course, sorry

[mr2d2]

Hello
start digging from client/src/views/record/panels/relationship.php, if you created it from relationship panel

I create from this panel.

[tanya]

in this case client/modules/crm/src/views/record/panels/activities.js method getCreateActivityAttributes