Define your own basis set
Example of basis format (6-31G basis):
**** H 1 0 S 4 2 18.73113700 2.82539370 0.64012170 0.16127780 0.03349460 0.00000000 0.23472695 0.00000000 0.81375733 0.00000000 0.00000000 1.00000000 **** Li 3 1 S 10 3 642.41892000 96.79851500 22.09112100 6.20107030 1.93511770 0.63673580 2.32491840 0.63243060 0.07905340 0.03596200 0.00214260 0.00000000 0.00000000 ...
To use your own basis that is not included in the bdf-pkg/basis_library, you can create a file XXX containing your basis in the same directory of the input and run script, and then specify the basis in COMPASS just like the normal basis by the name XXX.