Or you can define an array as public in the parent form and the in the child form assign the values to the array
then insert the values in the table:

Local lOk
Public Array aField(n) && Where n = number of fields you have
Do Form MYCHILDFORM To lOk
If lOk
* They click the OK button in child form
Insert Into MYTABLE(FIELD1,FIELD2,FIELDN) Values(aField(1), aField(2), aField(n))
EndIf
Release aField

You must define the child form as Modal and in Unload event Return .T. or .F. if they click the Ok button or the Cancel button