@kmarrs901 maybe you can check these examples. You might provide us with a sample and your desired result.
current date/time as filename - using the create temp dir node with java edit variable node
Excel Reader - force sheet_selection “NAME” with Flow variable
even more fun with URI, URL and File Paths - work with the new Path variable format to list and move/copy files - using the latest KNIME version 4.6
Import EXCEL - a meta workflow trying to answer questions about importing data from Excel files
Extract File Name and add new extension to Path variable