Vendor Master

How to copy a vendor. When you create a vendor with refernce all it does is creates the vendor within same acount grp, but all the other fields have to be filled in. I am asking because it is time saving not filling in the reconciliation account everytime the vendor is created or check marking "check double invoice" etc

Second question, how can we default "check double invoice" in vendor master as always checked, so when someone goes to create a vendor that field is always checked.

Thanks