Repartition Spell (5e Spell)
From D&D Wiki
|Casting time:||1 bonus action|
Divide a higher level spell slot of at least level 3 into three lower level spell slots in which the numbers of the lower level spell slots sum to the higher level one. The higher level spell slot is used up, and the new spell slots created must be used within 1 minute, or they are lost. If you have a spell slot of a higher level, you can transfer it down, say you have a level 5 spell slot, you can use it, to give yourself 2 1st level spell slots and one 3rd level spell slot. As long as the sum of the spell slots are the same, you can transfer them.