For example 200mil of bushels and 10mil of oil

Depends on what you want to do. If you just want most profit of that above then wait until bushels is at 45+.
Otherwise you could sell and if you are theo with decent military tech you can resell military after you have spent the money from the bushels to resell.
But ideal is to stock more and sell at a later point and have even more.

obviously this forum is more active so i understand but these threads seem more appropriate for strategy or Q&A forum

would be good to ask multiple questions in the same thread too


best time for alliance is usually last turn of the set on private

Just FA them to me and I'll make sure they get sold properly.