Hi Radhakrishnan R,
You can set up the Distribution Function to not have a yield during the set up time.
For exmple, in your case, you can set up
Duration 25% - Yield 0%, and then
Duration 100% - Yield 100%.
In this setting, your yield will only be expected during week 2 - week 4.
After that, use this Distribution Function in the DIstribution Keys, and assign this Distribution Keys to your production version.
Run the MRP with lead time scheduling, and you should see the expected yield in Planned Order only appear on week2 - week 4.
Best Regards,
Hengky