User story
As SSRs we would like a new plate purpose for a library stock plate so do mulitplexing sequencing submissions so we no longer need to do a fake cherrypick on library quant submissions.

Current situation: Plate of premade libraries that faculty make we supply them with a library manifest and stock plate barcode. Create a multiplexing submission. We can only do it on an LB-Lib-PCR-XP. Do a fake cherrypick on the stock plate to create an LB-Lib-PCR-XP to transfer the tags. Submission is in Limber-HTP.

Who are the primary contacts for this story
Liz / Siobhan / Steve / Katy

Who is the nominated tester for UAT
Liz / Siobhan

Acceptance criteria
To be considered successful the solution must allow:

• A new plate purpose 'library stock plate' which allows multiplexed sequencing submissions

Dependencies
This story is blocked by the following dependencies:

• #<issue_no.>
• sanger/#<issue_no.>

References
This story has a non-blocking relationship with:

• Y24-114 As SSRs we would like to not have to perform fake cherry picks on stock plates to make submissions so that we are not recording fake data. #4127
• sanger/#<issue_no.>

Additional context
Add any other context or screenshots about the feature request here.