When you import the DXF make sure that you set the origin of the import far enough away from the sheet origin. Depending on where the origin is in your DXF this can be 0,0 or maybe much further.
Say you have a DXF with its orgin in the center of the sheet and it is an 11x17.
Then the origin when you import should be greater than 5.5x8.5 otherwise your DXF will be out of bounds so to speak.
Another option you have is to select everything on that layer and move it by x, y. Select it by filtering, single layer mode then selecting everything, then press M, then select move selection by x,y...
Hope that helps otherwise i can give more detailed step by step with pictures.