Thanks again for the help Raj.
My final answer was to create the job of type SQL Server Integration Services, then set a variable ('TimeScale') within the SSIS package.
Once I set the job type to SSIS I could then 'Set Values' as follows (note that it is exactly as below - 'package' should be 'package', NOT the name of your package!):
Property Path: \package.Variables[TimeScale].Value
Value: Monthly
Full sample code to import into a job if you need the example. :)
USE [msdb]
GO
/****** Object: Job [Sample] Script Date: 10/28/2009 16:04:22 ******/
BEGIN TRANSACTION
DECLARE @ReturnCode INT
SELECT @ReturnCode = 0
/****** Object: JobCategory [[Uncategorized (Local)]]] Script Date: 10/28/2009 16:04:22 ******/
IF NOT EXISTS (SELECT name FROM msdb.dbo.syscategories WHERE name=N'[Uncategorized (Local)]' AND category_class=1)
BEGIN
EXEC @ReturnCode = msdb.dbo.sp_add_category @class=N'JOB', @type=N'LOCAL', @name=N'[Uncategorized (Local)]'
IF (@@ERROR 0 OR @ReturnCode 0) GOTO QuitWithRollback
END
DECLARE @jobId BINARY(16)
EXEC @ReturnCode = msdb.dbo.sp_add_job @job_name=N'Sample',
@enabled=1,
@notify_level_eventlog=0,
@notify_level_email=0,
@notify_level_netsend=0,
@notify_level_page=0,
@delete_level=0,
@description=N'No description available.',
@category_name=N'[Uncategorized (Local)]',
@owner_login_name=N'NTWK\FrostbiteXIII', @job_id = @jobId OUTPUT
IF (@@ERROR 0 OR @ReturnCode 0) GOTO QuitWithRollback
/****** Object: Step [Sample Step] Script Date: 10/28/2009 16:04:22 ******/
EXEC @ReturnCode = msdb.dbo.sp_add_jobstep @job_id=@jobId, @step_name=N'Sample Step',
@step_id=1,
@cmdexec_success_code=0,
@on_success_action=1,
@on_success_step_id=0,
@on_fail_action=2,
@on_fail_step_id=0,
@retry_attempts=0,
@retry_interval=0,
@os_run_priority=0, @subsystem=N'SSIS',
@command=N'/DTS "TestPackage.dtsx" /SERVER MyServer /MAXCONCURRENT " -1 " /CHECKPOINTING OFF /SET "\package.Variables[TimeScale].Value";Monthly',
@database_name=N'master',
@flags=0
IF (@@ERROR 0 OR @ReturnCode 0) GOTO QuitWithRollback
EXEC @ReturnCode = msdb.dbo.sp_update_job @job_id = @jobId, @start_step_id = 1
IF (@@ERROR 0 OR @ReturnCode 0) GOTO QuitWithRollback
EXEC @ReturnCode = msdb.dbo.sp_add_jobschedule @job_id=@jobId, @name=N'Weekly Step',
@enabled=1,
@freq_type=8,
@freq_interval=3,
@freq_subday_type=1,
@freq_subday_interval=0,
@freq_relative_interval=0,
@freq_recurrence_factor=1,
@active_start_date=20091028,
@active_end_date=99991231,
@active_start_time=80000,
@active_end_time=235959
IF (@@ERROR 0 OR @ReturnCode 0) GOTO QuitWithRollback
EXEC @ReturnCode = msdb.dbo.sp_add_jobserver @job_id = @jobId, @server_name = N'(local)'
IF (@@ERROR 0 OR @ReturnCode 0) GOTO QuitWithRollback
COMMIT TRANSACTION
GOTO EndSave
QuitWithRollback:
IF (@@TRANCOUNT > 0) ROLLBACK TRANSACTION
EndSave: