Could you please clarify which Connected to detail you are referring to? The one that is on activity page or you just want to add connected order there?
I want to add Connected To detail that is in document section in custom section and detail should have similar fields.
I have attached screenshot
The easier option would be to add connected lookup fields, linked to the corresponding objects, to the object (in wizard) and instead of detail creating a Field group and name it Connected to(http://prntscr.com/o9j383). After that you can just add those fields in this field group. In your case this would perform the same way as Connected to detail.