FOR XML PATH - how to implement grouping?

I have a T-SQL code which creates XML files out of database table. The tables contain order responses info. Each record represents a line of the response. For each response there are many lines.

The query returns one result for many records in the table. I want to rewrite the query to return one result set for each order response (not each line). The XML file should look like that:

<Line-Item>
  <Line>xxxxxx</Line>
  <Line>yyyyyy</Line>
</Line-Item>

Currently the code looks like that:

Select '231' as "OrderResponse-Header/OrderResponseType",
   'Const' as "OrderResponse-Header/OrderResponseNumber", 
   coalesce(convert(varchar(10), GETDATE(), 20), '') as "OrderResponse-Header/OrderResponseDate",
   coalesce(T.OrderNumber, '') as "OrderResponse-Header/OrderNumber",
   coalesce(convert(varchar(10), GETDATE(), 20), '') as "OrderResponse-Header/OrderDate",
   '0' as "OrderResponse-Header/DocumentFunctionCode",

    '' as "DetailsOfTransport/TermsOfDelivery",
    '' as "OrderResponse-Parties/Buyer/ILN",
    '' as "OrderResponse-Parties/Buyer/PartyName",
    '' as "OrderResponse-Parties/Buyer/StreetAndNumber",
    '' as "OrderResponse-Parties/Buyer/CityName",
    '' as "OrderResponse-Parties/Buyer/PostCode",
    '' as "OrderResponse-Parties/Buyer/Country",

    '' as "OrderResponse-Parties/Seller/ILN",
    '' as "OrderResponse-Parties/Seller/PartyName",
    '' as "OrderResponse-Parties/Seller/StreetAndNumber",
    '' as "OrderResponse-Parties/Seller/CityName",
    '' as "OrderResponse-Parties/Seller/PostCode",
    '' as "OrderResponse-Parties/Seller/Country",

    '' as "OrderResponse-Parties/DeliveryPoint/ILN",

    '' as "OrderResponse-Parties/ShipFrom/ILN",

    coalesce(T.LineNumber, '') as "OrderResponse-Lines/Line/Line-Item/LineNumber",
    coalesce(T.BuyerItemCode, '') as "OrderResponse-Lines/Line/Line-Item/BuyerItemCode",
    '' as "OrderResponse-Lines/Line/Line-Item/ItemDescription",
    '' as "OrderResponse-Lines/Line/Line-Item/ItemStatus",
    '' as "OrderResponse-Lines/Line/Line-Item/ItemType",
    '0' as "OrderResponse-Lines/Line/Line-Item/OrderedQuantity",
    coalesce(T.QuantityToBeDelivered, '') as "OrderResponse-Lines/Line/Line-Item/QuantityToBeDelivered",
    '0' as "OrderResponse-Lines/Line/Line-Item/QuantityDifference",
    '' as "OrderResponse-Lines/Line/Line-Item/UnitOfMeasure",
    '0' as "OrderResponse-Lines/Line/Line-Item/OrderedUnitNetPrice",
    '0' as "OrderResponse-Lines/Line/Line-Item/Discount",
    coalesce(convert(varchar(10), T.ExpectedDeliveryDate, 20), '') as "OrderResponse-Lines/Line/Line-Item/ExpectedDeliveryDate",
    '0' as "OrderResponse-Summary/TotalLines"
from Import.OrderResponses as T
where T.OrderNumber = 'Gr342'
for xml path(''), root('Document-OrderResponse'), type

Do I have to create another table for each line and join the 2 tables together?