ATO- Strategy 40, 50

Hi, pls clear my doubt. I think that in strategy 40 (mts), all the subassemblies are manufactured without s/o, and upon receiving the order the final assembly will takes place. where as in strategy 50 (mto), process is same as above mentioned and in addition there will be value addition activity or operation will be done. in that case shall i consider that 40, 50 strategies are for ATO? Do we have seperate strategies for ATO, If so wht will be the difference between both?