1. Managers can apply for time off on behalf of their reporting employees by typing in the command "Apply leave @Username" and follow the prompt. This feature works for all types of leaves - vacation, sick and wfh.
2. Update the details like leave type, date, time etc by using the drop down and select the option "Few Hours" for Leave Duration and hit Submit
For stepwise guide on how to apply for leaves, you can refer to this help article.