For example you have a folder called E:\Folder and there are dozens of sub folders under this folder like E:\Folder\1 to E:\Folder\100, now you want to put your input file file.inp into each of these sub folders.
First you put your file.inp under E:\filelocation.
Then you put following text in a new txt file, save it as whatever.bat, a batch file.
for /r “E:\Folder” %%i in (.) do @copy “E:\filelocation\file.inp”
double click to run the whatever.bat, work done.