Our school is K-12 and with the district we are listed as 3 schools ( Elem, Middle, High) and our PTO would service the whole school.
We were lucky enough to have parents that often had mulitple children in the school (My family has 1 HS, 1 MS, 3 Elem students) and we found it easy to work that way.
The biggest job we had was to find balance in our help with funds but we were able to est. that in the fall K-5 would benefit from new balls etc for the playground with our Campbell Soup labels; Middle School has three big field trips they offer SO the PTO hosted skate parties with a local rink (social night out and a fundraiser!) and for the High School we had the scholarship money we gave the Valitorian and Salutitorian (my spelling is terrible) alone with many volunteer ops as well hosting fundraisers for the new Key Club and Honors Club.
That is just a small part and off the top of my tired
brain. We also worked very close with each Principal to support the needs of kids that needed uniforms (even had a little one that needed shoes--very sad story).
Yes, lots of organizing and lots of planning and it crumbled when one mom found it to be too much. My heart still breaks and I'm having a hard time typing knowing how much we were able to help.
It can be done and your school will be greatful. Great things can be done by a small number of people!