>I use a grid for the detail of an order entry form, I added methods to the grid rather than the form because the same grid is used on several forms. One method, I call DeleteOne, deletes the current record of the recordsource of the grid. I begin a transaction,make updates to three other tables effected by the delete, and if all is successfull, delete the record, if not ROLLBACK.
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>Now I want to add a method that deletes all records in the grid which is detail for a single order. Call it DeleteAll and I want to begin a transaction, start at first record and call DeleteOne ( remeber this method uses BEGIN TRANS and END TRANS in itself ) and move through the detail records calling DeleteOne on each record. If for some reason one record can not be deleted and I issue ROLLBACK in DeleteAll method, will the tables updated when END TRANS was issued on each record in DeleteOne be rolled back also ?

if coded correctly, yes.