Hi,
regarding your first question: unfortunately IFS IEE does not support defaulting fields in dialogs. This is a framework restriction.
Regarding the second part: I assume you mean you would like to keep track, which Business Lead it originated from. This is currently not possible, because the Business Lead is deleted upon conversion. We understand that some IFS customers would like to preserve the Business Lead record for later analysis, so we are going to implement in the next - IFS Cloud Releases - measures, so you can decide if you would like to keep the Business Lead or not.
I hope this was helpful.
Best Regards,
Ata
The second question has already been raised with the R&D from below Community postand the answer was that will be enabled in IFS Cloud
Business Lead records deleted in the process | IFS Community