You can use an if statement in the "current" event to set the locked value
for each control based on another field.

In other words, if you have a checkbox on your records called "complete"  or
"locked"  you could test to see if this was checked.  If it was, then you
would set the controls locked value to true.

Since you don't tell us how you'd determine which rows could be editted and
which can't, it is difficult to give you a detailed answer here.

Rick B