SamT ,

thanks for your comments for the elephant.

for your information this was running well when we planning on 100 rows before with formula. But now its not possible as we need to plan uo to 1,500 rows due to the factory capacity which has increase and that is why i am opting to do it with VBA.

Also in textile we always has dept to start based on previous dept date and for me this what we call planning in our sector and if this is the case do you think we shall put the date manually for it to calculate. Its impossible then in that case you are asking me to make the planning sit 3 hours with 10 people together to be able to give a good planning to production people.

I understand it complex and difficult that is why i need help on it.

Do you have a better recommendation of doing it.