Kia ora… to start with what were they prior? Benchmarking against prior is a good place to start however we are all facing some level of uncertainty as to what the new norm will be.
Personally I’m basing more forward projections by building them ground up my off actual hard/fixed costs and then building up from there as to minimal revenues needed to cover these and working my variables based off my history as a % of turnover and running a couple of scenarios of low, medium and high relative to what my gut is telling me and speaking with customers.
Hope this helps… but building bottom up and then running potential revenue scenarios down based on assumptions is a good way to pressure test.
All the best!