Examine the categories in the cabinet to determine the filing order being used. Common filing systems are alphabetical, numerical and chronological. Files could also be arranged by subject matter or geography.
Compare the label on the folder to the labels on the cabinet drawers to determine where your file should be. For instance, in an alphabetical filing system, a drawer may be labeled for folders with titles beginning with a letter in the group "A to G." In a numerical filing system, it could be labeled for folders in the group "00001 to 00030."
Open the appropriate drawer and look through the labels to determine the best location for the folder. If the folder is labeled "G-00035" then it should be between folders "G-00034"and "G-00036."
Insert the folder. It should be aligned with the other folders and facing the same direction so the label is visible.