Associating phone numbers on opportunities from parent lead

[SkerryAmp]

Am wondering if someone could tell me what I am missing or what I am doing wrong, or heck, if I am being stupid (I can take it).

I have been tasked with adding phone numbers to opportunities which are tied to the parent lead.

Opportunity didn't have phone number so I added a phone number field via json, so that shows up.
I can set a single phone number from lead to opp.
The trouble is phone number can be phoneNumbers - no matter what I have tried I cannot get them to show up.

I have looked at relationships, nothing there seemed to help do what I want - maybe I missed something.
Programmatically I can "get" the phoneNumbers from the lead, but I can't seem to "set" the phoneNumbers on the opp.

I would share code but I have tried so many things there is no single codebase to draw from.

Any guidance, suggestion or even a "hey dummy do this" (again I can take it and if it helps me move on I will gladly take it), would be a huge help.
I will apologize I have only been working with Espo for literally a month so it is also possible I just don't know the right question to ask - but have been a developer for many year so can again, can take it =)

We are on Espo 8.3.2 - we want to upgrade but are not in place to do that yet.

[lazovic]

Hi SkerryAmp,

Please tell me if I understand correctly that you want to fill a custom field for phone numbers in the Opportunity entity with several phone numbers from the Lead entity?