Via the import tool you can apply parameters and parameter values to products. This requires that you have created parameter groups and their parameters before.
You download the import template by going into the Import Tool in the menu and clicking on New and then in the Template type drop down, choosing Product Parameters and clicking on download file template.
Below follows a description of existing colums.
(There's also a short description in Merchant Center under View template description)
| ProductId | Id for the product that the parameters shall import to. |
| ProductName | The products name. Mandatory if the Id is not filled in. Can be left empty is there is an Id. |
| ParameterGroup | Name of the parameter group. That which is set in the field Group Name in on the parameter group. |
| ParameterName | Name of the parameter. Field name on a parameter |
| Value | The value you want a product to have on it's parameter. Needs to match a existing value if it's a type picker or multi picker. |