Or try the new 'Record Click Track' option.

For manual entry;
I usually just enter one measure of a side stick (or cowbell) on the default synth <grin>
Then copy/paste that measure using the Repetitions option and paste 100 measures or so.
It's pretty quick way to get a controlled click for a few minutes depending on tempo.

You can always adjust the Repetitions to be 1 or 5000+, depending on how many measures you need


Make your sound your own!
.. I do not work here, but the benefits are still awesome