I have created a (SSIS) package which contains SQL procedures for transfer of data from tables. It is in .dtsx format as per SSIS package. Now how to add this to a schedular
You may also schedule your SSIS package using the following files:
"C:\Program Files\Microsoft SQL Server\120\DTS\Binn\DTExec.exe" /f
"D:\Package.dtsx"
You can run your SSIS package using dtexec
command like from dos command prompt
dtexec /f %PackagePath%\%PackageName% /conf %PackagePath%\%ConfigName%
you just add this command to a batch file (.bat) and have that scheduled in your scheduler.
Check this link on DTEXEC utility
http://msdn.microsoft.com/en-us/library/ms162810.aspx
Hope this helps.
An other solution is to schedule the packages through SQL Server agent and creating a job so that you can scedule it once in 3 months.