The partnership in this good deed means that Torah scholars will engage in Torah study, while their supporters provide them with necessary support. In return, the supporters share in the scholars' rewards, as stated in the Rema, Yoreh De'ah, Siman 236, Section 1.
This partnership is like lighting one candle from another. As it is written in the holy book Or HaChaim, Parashat Ki Tisa, and in the book Ktav Sofer, the learner does not lose anything from their reward, and the donor receives full reward for their learning. "Zevulun shall rejoice in your going out, and Issachar in your tents," signifies that everyone should rejoice in their own part and not take from their friend's.
These support funds will be used for the elevation in Torah and to rise in pure fear of the Lord. They will ascend to the merit of the supporter with a generous hand, bringing safekeeping, blessing, and success. The merit of the commandment will affect the supporter and their household, ensuring that the Torah will not depart from the mouths of their descendants. All their prayers will be accepted favorably before their Creator.