Advanced CSV Connector is an extension of classic Akeneo CSV Connector. It allows to customize columns mapping with custom entity in your PIM project:

Lot of mapping parameters are available:

• Transformation: Use LUA scripts created in your PIM project to update values dynamically
• Only on creation: To set value only for product creation (avoid erasing contributions) 
• Default value: To set a value when column is empty
• Etc.