To do these settings, you need to go to your Syncee Dashboard and then to the Import Task submenu. Choose your task, and go further.
You can set the prices of different products ("cost per item") with the help of the "Cost Per Item" field in the selectbox under "Mapping". Please note that only positive values are accepted in Shopify (numbers above zero).
If you want to set this value to be automatically updated when you run the task, then all you have to do is to find the "Cost Per Item" box and leave it checked (The default setting of what will be updated is the Price and the Inventory Quantity data).
Please note that the running time of the task will increase if you use this setting.
Feel free to contact our support staff if you have any further questions.