Hi Aj,
I am not quite sure if I fully understand your concern.
The screenshot shows an inbound E-Mail in an IC E-Mail editor. This E-Mail is linked to a transaction - seems as it is linked to another E-Mail - an E-Mail activity from One2One Integration?
Does this mean, you want to link the specific inbound E-Mail to another E-Mail activity?
Usually, in the reference dropdownlist box, displayed or created transactions are shown. Then IC agent can select the one to which the inbound E-Mail should be linked. This function is usally used to link the E-Mail to Service transactions like service requests and not for One2One E-Mails.
Does this help?
Best Regards,
Sigrid