>>suggestion for add new record to grid:
>>
>>since Parent table use newid(),
>>set the child table's key's default value to get the current parent value from the setup table;
>>
>>This will work!
>
>It cannot work in a multi-user envirnoment.

Tai, add a form property and store the parent key to this property. This will work in a multi-user environment because each user has a separate version of the form on his/her computer.

HTH
Barbara