To do this, break the period into two parts.
The first - to the excluded time, the second - after.
Let's say we have this daily recurrence:
For example, we need to exclude all of October from it.
So, we go to the recurrence settings and set the Repeat till to September 30.
Then we create a new period starting at November 1 with the same daily recurrence.
Finally, we will have these periods:
Thus, we have excluded time from the recurring period.