Adding Custom Cleric Spells

Can Weidu be used to add a bunch of custom spells to a cleric's spell table?

Let's say I have 2 new spells; MYSPELL1.spl (level 3) and MYSPELL2.spl (level 5).

How would I add these so that they show up in a cleric's spell list once s/he hits the appropriate level?

Also, I'm somewhat confused by the description appending in Weidu. Can anyone provide or point me to a sample file where it shows how to add the descriptions and names of a bunch of custom spells into the game?