No you don't need to do that ^
All you do is when you choose a team click on the country you want , then go to their U-21/U-19's and take control.You do not need to manage the senior team , i did this numerous times on FM10 with England.
It is actually really fun being able to supply the senior team with youngsters
Cool, I'll try that now. Yer that's why I want to be able to do it but never found a way before.
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Just done it and you have to go into Detailed Team Information then select the age you want but it worked. Also can anyone tell me if U-19's have competitive matches like Euro U-19s or not? All that's on their fixture list is U-19 international, no qualifiers or anything.