Autopopulate second combobox based on first combobox

I have two tables

1 – tblAddNewStudy

StudyID

StudyName

StudyDate

PointValue

2 – tblEmployeePoints

EmployeeID

StudyID

PointValue

I have created a form showing Employee ID, Study ID and PointValue from the
tblEmployeePoints.

The form has a combobox for the StudyID field. I want the PointValue field to
autopopulate once the StudyID field has been selected by the user.

I want the PointValue that is autopopulated stored in the tblEmployeePoints
table.

Using Access 2002.

Any suggestions? Thanks