suppose entity is: x
field is x1 --this value need to update
field is x2---this value fetch to 2nd entity
second entity is: y
field is x2----using this we fetch data
field is y1= data type option set
field is y2= data type option set
field is y3= single line text() (multiply with x1*y3)
result will show entity : z
field is Z3