How to Generate Multiple Entities at Time 10 (sim events)

I am a beginner and wants to generate multiple entities at time 10. I found the following code to generate 10 entities at time 0, however, I could not understand it that what should I change to generate entities after a specific time.

Code

N=10;

persistent dtArray index

if isempty(dtArray)

    dtArray = [zeros (1, N) inf];
    index = 1;
end

dt = dtArray (index);

index = index + 1;

[Muhammad Asad Hanif]

I used entity gate to control the entities and got my desired result, but do let me know if there is any more appropriate logarithm for this job.