hi Gary ,
It is a very open question ,
Generally ,to make sure you should consider this line as a separate and make sure that all the requirement for BRC is in place for this line , special HACCP for this line is required , validation and verification , control of rework used for bottles , in-process quality plans /inspections , the finished bottles should be assessed for microbiological and chemical analysis like bisphenol-a (BPA) for PET , tractability for each batch of bottles , my advice is to make a BRC self assessment for your new line to discover any missed point , you can also increase your knowledge using BRC for packaging guideline .
the auditor will consider it a separate line and will audit it as an another line , so if your SOP dose not applied for this line you will be violated
best regards ,
Ehab