Price Book and Quotes Function Question

Price Book and Quotes Function Question

I have been following a topic on Price Books and it is now locked.  Wondering if anyone would be able to tell me what the coding at the end of the discussion does and how I can implement it (figuring it provides the solution I am looking for)

https://help.zoho.com/portal/en/community/topic/associate-price-books-and-accounts-for-quote-generation

Here is the coding provided by Zoho:

quoteDetails = zoho.crm.getRecordById("Quotes",quoteId);
//info quoteDetails;
productDet = ifnull(quoteDetails.get("Product_Details"),"");
prodlist = List();
for each eachProd in productDet
{
productvalue = eachProd.get("product");
PdLineMP = Map();
PdLineMP.put("product",{"name":productvalue.get("name"),"id":productvalue.get("id")});
PdLineMP.put("id",eachProd.get("id"));
PdLineMP.put("book","2985578000000667059");
prodlist.add(PdLineMP);
}
quotemap = Map();
quotemap.put("Product_Details",prodlist);
updateResp = zoho.crm.updateRecord("Quotes",quoteId.toLong(),quotemap);
info "===========";
info updateResp;