The phrase "remaining filling" refers to the amount of a substance or material that is left over after some of it has already been used or taken out. Full definition
Once browned (about 5 minutes) and sausage is cooked through, add remaining filling ingredients and sauté for 2 - 3 minutes until tender and well combined. (wordslikehoneycomb.com)
Add second layer, crumb side up; frost side and top of cake with remaining filling. (bettycrocker.com)
Spread remaining filling into the bottom of the prepared graham cracker crust. (mostlyhomemademom.com)