Yes thanks! I found it before dinner...

it works well...I would like to write it, but you overtook me...

I write the full solution. So others can see it:
IUtaInt32 hData = 200;
HUTAPBDEF MyTable = UtaTableRegFindTable("NameOfMySymTable", false);
UtaPbSetInt32((HUTAPB)MyTable, "var_name", hData);
UtaTableSave(MyTable,"NameOfMySymTable.sym");
Thanks a lot for your help!