Hey Joyce,

Its good practise to minimise any editing of live courses, it can lead to completion complications - not least of which is different Learners potentially completing different content for the same course. 

There's also the Restrict Access functionality which is related.

'The restrict access functionality (previously known as conditional access) allows you to set certain criteria that must be met for learners to view and/or complete an activity or resource'. 

regards,

George.