Apex code for implementing a custom clone quote button for Big Machines related work. The following takes a child opportunity and clones the Big Machines quote from the parent object onto the child opportunity

gistfile1.txt

PageReferene pageRef = Page.BigMachines__QuoteEdit;

Map<String,String> parms = pageRef.getParameters();

//Get First (Primary) Big Machine Quote From current Opportunity's parent opportunity
parms.put('Id',parentOpp.BigMachines__BigMachines_Quotes__r.get(0).Id);

//Clone the parent into the the current aka child opportunity.
parms.put('oppId',opp.Id);

parms.put('clone','true'); 
return pageRef;