In online mode in each watch list you can force values and write values.
In the tabular editor you can enter a value in column prepared value and thus prepare that value for forcing or writing on the PLC. For this purpose select the respective cell (mouseclick resp. navigation within the table via the arrow keys) and by a mouseclick or the <Enter> key open a dialog for entering the value. If they have the same data type, also the cells of multiple variables can be selected at once in order to get the same value prepared for all these variables. For multiselection of the cells just keep the <Shift> button pressed while selecting the particular cells.
In the 1-Window-Editor by a mouseclick on an specified variable value you also can open a corresponding dialog for entering the value which should be forced or written.