Select from combobox then subform update

[Janjang]

plz help me how to do it...

plz look at tables
i have "monthyear" & "partno/details and month" table

i cant open all part that have same month at table monthyear...
but i can open n view customer that bought same part at partno/details...

then i cant create form from table Monthyear..i want to create form as form "test"

plz help me...
am i need a coding?
can u show me the coding?
i'm new...plz..

ahh. cant post my DB....my db size to big...700kb after zip
cant i post screenshot?

 

[Janjang]

sorry...
now i can post the db after create new db then import from original....
try then plz give some solution bout it....

thanks