Thanks in advance
Here I am trying to add my custom module to email modules Related to a dropdown, Here I add relation with email, but it does not work.
I have added the screenshot please find this.
Please help me.
In Studio go to your custom module
Add relationship to “Activities”
This is the Activities & History sub panels and can be linked with custom modules and also will add it to the “related to” dropdown 
Thank you for response,
but please suggest me what type of relationship add between custom module and Activity and History
Please describe sir . and here in dropdown editor there are not any “Related to” dropdown exist so where can i add option of my custom module
Yes
Add a One to Many
When you do this it will add the option to the dropdown
The dropdown name is something like parent_type_display
Thank you so much. now it’s working fine.
Glad to hear