Why we only choose one Holiday in Employee Terms ?

i think we can choose more than one Holiday, because the office maybe have different holiday dates than the national calendar

Your understanding of how Holiday scheme works is incorrect. Kindly check the user guide for more details.

i understand about Holiday Scheme, i choose 1 Holiday in that picture the name is “Holiday office 2025” in that Holiday have more than 10 holiday, but in my Company have separate policy, like
for example in the National Calendar there is Joint Leave,
now in my company sometimes joint leave depends on the HRD policy whether it will be joint leave without cutting leave or cutting leave.
so why do I want the Holiday section to suggest that more than 1 can be selected, because if I have to set it in the Leave section, isn’t it troublesome if there are many employees?

Why don’t you set up one Holiday scheme with Joint Leave, another without?