I want to set a group price by adding a percentage to the cost of a product(s) in my store.
Is there a way to do this without adding an extension?
How can I achieve this programmatically?
The answer to this questions appears to lie in the table
It stands to reason that it is possible to do this programmatically by creating a markup cost + x% and then populate the field "value". The entity_id is the products Magento ID, the customer_group_id is the ID of the Group you wish to give special pricing.
Bounty expires in 2 days, if I don't get at least an SQL statement I can work with I will let it expire.