Help saving data association

help me for save association in association
$datatrx_notagesek = $tabeltrx_notagesek->newEntity($terimadata, ['associated'=>['SubtrxNotagesek'=>['Profit'],'TrxRekening'=>['validate'=>false]]]);

itry that code but cannot work
Trxnotagesek has many subtrxnotagesek and subtrxnotagesek has one profit
My request data
data = ['subtrxnotagesek'=> profit=>'' ]