Consider a situation when we import some file in a .nb from a sub-directory located at the directory where .nb is located. We need to write specific path to the file. Next, suppose that we moved file to another directory. Then one needs to change the directory of the the file in .nb.
Is there any way to allow Mathematica to import the file simply by its name, without the specification of its location? I.e., to set up the file name and that the file is located somewhere in the .nb directory.