Applying OWP but imm5710 doesn't have enough space for employment

[oyg567]

Hi, I am applying for OWP after getting AOR, the problem is it says need to provide details of 10 years employment.
Three spaces are not enough for me so I tried to combine the file with extra pdf sheet. But I guess this is validated file so doesn't allow me to do that.
Should I print all and scan it??

Thank you in advance!