Documentation requirements for production process

Answer:

I assume by "iso" you mean ISO 9001:2015. When it comes to explicit requirements for documentation in the production process, ISO 9001:2015 requires following:
- The characteristics of the products to be produced, the services to be provided, or the activities to be performed (clause 8.5.1)
- Records about customer property (clause 8.5.3)
- Production/service provision change control records (clause 8.5.6)

But, you may also decide to document production procedure, work instructions, etc. For more information about mandatory documents, see: List of mandatory documents required by ISO 9001:2015 https://advisera.com/9001academy/knowledgebase/list-of-mandatory-documents-required-by-iso-90012015/