OPM Quality tests and test method and specification

We are implementing in a Pharmaceutical and have requirement that while testing for example a microbiological test of 'Microbial limit test' it can have methods of 1- Most probable number and 2- Membrane filtration method and user can execute the same test via multiple methods while testing. Problem is if we define multiple tests for example "Microbial limit test - Most probable number " and "Microbial limit test - Memorable filtration method"then it is not necessary the user will enter results against all of them. Can anybody help regarding this? Requirement is user should be able to select the test