How to compress the PDF files in a folder and and sub-folders recursively?

Hello, I have the following directory, C:\Electronic Invoice\B01\20170101\10.PDFC:\Electronic Invoice\B01\20170102\11.PDFC:\Electronic Invoice\B01\20170103\12.PDFC:\Electronic Invoice\B01\20170103\13.PDFC:\Electronic Invoice\B01\20170204\15.PDFC:\Electronic Invoice\B01\20170209\16.PDFC:\Electronic Invoice\B01\20170211\17.PDFC:\Electronic Invoice\B02\20170103\01.PDF Can I compress everything in a single command line? Customer----------------------------------------------------...