I'll do a very simple proof of concept for you, as you gave us zero to work with.
This should give you a place to start... you could replicate the SP as needed for doing different interval based inserts, just change your naming and the interval type as needed.
First I'm doing a very simple table to hold your data. It needs more than this... but I have no clue what your needs are
CREATE TABLE EmployeeSchedule (
ScheduleID INT IDENTITY(1,1) NOT NULL,
And then a simple stored procedure to insert a series of dates
CREATE PROCEDURE dbo.EmployeeSchedule_Insert_WeeklyReoccurence (
DECLARE @ScheduleDate DATE = @StartDate
WHILE (@ScheduleDate <= @EndDate) BEGIN
INSERT EmployeeSchedule (EmployeeID, ScheduleDate)
VALUES (@EmployeeID, @ScheduleDate)
SET @ScheduleDate = DATEADD(wk, @WeekInterval, @ScheduleDate)