If you want to insert a text in your drawing (e.g. to the title block) which contains a manipulated name of the current drawing file - e.g. the filename left-trimmed or right-trimmed at a number of characters, you can use a combination of Diesel expressions in an automatic text field (e.g. with the FIELD command).
Drawing file name, no path, from the 3rd character (paste as a Diesel expression to a Diesel-type field):
Drawing file name, no path, no extension (4 characters), right-trimmed at another 3 characters (paste as a Diesel expression to a Diesel-type field):
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