It's not advisable to remove your son from the yeshivah to teach him a trade.

Many people manage to marry off their children despite financial difficulties. This is all the Yetzer Hara at work—first, he distracts you from Torah study, and now he’s targeting your son. Instead, focus on guiding him to become a rabbi or a shochet, whichever suits him best. https://www.torahrecordings.com/rebbe/igroskodesh/011/010/3614