Scale - Sets a scale option for importing a document.
Coincident - Brings in a reference file, also known as an inserted object, at full scale (1:1) and coincident to its original coordinate position. The setting shifts the drawing sheet to the lower left of the document graphic range and then determines a drawing sheet scale that fits the reference file within the sheet. If the current document already contains graphics, the drawing sheet shifts to include those graphics.
If you use the Coincident setting, the reference file does not appear when you drag the pointer.
Select Scale - Sets the drawing scale to a standard ratio. The specified ratio defines the size of the drawing in relation to the size of the real-world object. For a 2:1 ratio, 2 represents the size of the drawing and 1 represents the size of the real-world object.
Fit to Sheet determines a drawing sheet scale that fits the reference file within the sheet but allows you to specify where to insert the file by clicking on the drawing sheet.
Custom Scale - Sets the scale that you type in the boxes for a document that you insert or drag. For example, when you type in 3 and 2 in each of the respective boxes, the scale of the foreign document is one-and-a-half times its original size.