Donated spell as part of other same spells ( Same lvl )

I think it is better to make donated spells as part of other same spells ( both have the same lvl )

for example

if i have 3 EQ spells lvl 4

nd i get donated EQ lvl 4

i shall have all 4 EQ spells lvl 4 in the same spot

if they are not in the same lvl then you can seperate between them

Today i forgot a donated spell bcuz i thought i used them all