Hi, I am selling a door lock and matching key service.
The matching key service I offer to customer need to purchase 2 or more lock set.
BUT, customer just need to pay for one mtaching key servie out of 2 lock set purchase. If customer purchase 3 locks set, then pay 2 key matching service, buy 4 lockset, pay 3 key matching service, etc..
so, here is the situation I have.
lock price: 100
option: Key matching service
No: no charge
Yes: Add $30
so when customer add 2 lock set: 100x2=$200, the customer just need to pay "one key matching service which is $30"
but, current system add $60 when 2 item is add to cart and the key matching service option is selected.
How to achieve this without adding many key matching option in the product attrabute, like adding
1 keymatching service: add $30
2 keymatching service: add $60
1 keymatching service: add $90
1 keymatching service: add $120
etc, etc.
I have seen price factor and offset stuff in attrbute controller, but seems it's not the way to solve my problem.
Thanks in advance.
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