"Clear Formatting" option that is available from
Format-> Font-> Clear Formatting
When a area is choosen and clear Formatting is clicked, it would act the same as outlook's "Copy only Text" when something is being pasted from somewhere else into outlook.
What i am trying to accomplish is to try and remove formatting when it is being pasted into the Infopath form. We currently have different users pasting data from different sources like web, word documents, PPT's, etc and they are lazy to do it manually. They want it to happen as they paste text into the textbox.