Price level header

I have a product and would like to create multiple price levels for this product using the eConnect API in C#. 

When I generate the XMLDocument, do I need to create a price header for each price line? Or will one price header work for multiple line items placed into the price line?

I'm using the following objects:

• Price list type - IVCreateItemPriceListType
• Price Header - taIVCreateItemPriceListHeader
• Price Line Item array - taIVCreateItemPriceListLine_ItemsTaIVCreateItemPriceListLine
• Price Line - taIVCreateItemPriceListLine_ItemsTaIVCreateItemPriceListLine

I'm assigning the header and line item array to the price list type and finally any price line will be assigned to each index of the array.