Create customer tickets from Back-office tickets

Additional information from our 1LS team : 

Description: We need the ability to create new customer tickets directly from an internal ticket so that all the necessary information is linked to the same issue as in a problem/tracker ticket. 

Current situation:
- We can only create a customer conversation from the right side of an internal ticket.
- This conversation can only be sent to the agent who opened the internal ticket, not to multiple external customers.
- Only one conversation is allowed per internal ticket.

Current workaround (2LS → 1LS):
- 2LS creates the internal ticket.
- 2LS provides 1LS with the customer details (there may be several customers).
- 1LS manually creates a customer ticket for each customer: Start a conversation, then convert it into a customer ticket.

Problem with this workaround:
- There is no option to link these new tickets back to the maintenance/internal ticket once notes are used.
- Information is sometimes too long for notes.
- Tracking becomes fragmented and manual.

Impact:
- Can lead to misunderstandings.
- Creates room for error, such as:
    * Missing recipients,
    * Incorrect subjects,
    * Lost ticket references,
    * Privacy Breaches.
- Increases manual effort and complexity.
- A simple action becomes a multi-step process, affecting workflow efficiency.

Expectation:
Maybe add a button on the right side, under the “side conversation” button, to:
- Create several new customer tickets from scratch to a contact email address that we choose
- Automatically use the correct “from” email address
- Allow linking back to the original internal/maintenance ticket