You can do it. Search the forum, there's a few topics on it.
have you read MQL4 book?
MQL4 Book - Programming of Trade Operations - Modification of Orders

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Friends,
I would like to create orders with a trailing stop using OrderSend() or OrderModify().
is this possible? how do it do it?
your help and knowledge is greatly appreciated.
thank you very much
mql4_newbie