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Jaimin
How to create relationship between a custom objects and products line item ?
I was looking for a clean approach where I can apply multiple Products' to a Proposal(Estimate). Would need to be able to add an unknown number of Products to the Proposal(Estimate), along with details for each "Product Line Item". Original approach was to create a Proposal(Estimate) custom object, and have a lookup relationship to the Products object, which contains a listing of all Products. And no need for pricebook.
Custom Object Standard Objects
Proposal(Estimate) = Products
Proposal Line Item = Products Line Item
Custom Object Standard Objects
Proposal(Estimate) = Products
Proposal Line Item = Products Line Item
In your description - you're saying that Products Line Item is a standard object - Products Line Item is NOT a standard object. Opportunity Line Item IS a standard object.
I'm not sure what you're trying to do - but maybe you're trying to add more details to the Opportunity Line Item - you're calling it a Proposal. And in this case - you could have multiple Proposals per OLI. If that's the case - then add a lookup field on the Proposal object to OpportunityLIneItem.