how to avg the sl/tp (Combine SL and TP of multiple bracket orders into one)

if i opend 10 contracts position having 1 contract at a time to dca the position, the entry avg the the all the 10 contracts but is open indivisual sl/tp for each contract

motive: want to open multiple contracts say 10 contracts one by one, having tp/sl 50 ticks, avg out all order with one cancel other (when sl or tp hit)

from above if i open 1 contract it will open with 50 tick sl/tp, but if i open 2nd contract then the existing order will be avg out but tp/sl will be open as separate for 2nd order but not avg out,

1) in this case if tp/sl hit other one will not close automatically
2) when bracket order selected even after trade closed need to close sl/tp order manually (image 2)