Builiding a mask in Premiere Elements 2022

Hey guys,

i'm really an amatuer in this field and im trying to do my first own film of a vacation i just had. I'm doing a pretty fast transition from picture to picture and lining them up with an underlying music track. It is really annoying to clip every picture one by one into the correct length and add it up to the track thats why i wanted to ask: Is there a way to build a mask in premier elements which i can use to save some working effort. The musical pattern repeats itself after like 20 seconds and i wanted to know if there is a way that i build a model or mask once for the first 20 seconds and the first number of pictures and then use this and just have to input the next number of picture without having to line them up to the music again? 

I hope it became clear what i meant,

Thanks in advance , Tim