Auto populate custom field values in Opportunities form

 We have created custom fields in Accounts and Opportunity forms. We need to auto populate the respective custom field values in Opportunities form based on the account selected in Opportunities form. Please share the jscript for the same.

Accounts Form

Custom Field 1 : Business Type (Type - Lookup)

Custom Filed 2 : Business Process (Type - Option Set)

Opportunities Form

Custom Field 1 : Business Type (Type - Lookup)

Custom Filed 2 : Business Process (Type - Option Set)

Thanks

Raj