Ok, Turns out you need to have a "clone" of the paragraph and then by setting the start and end of the range within the cloned variable you are able to set where in the paragraph you want to edit. As follows:
Word.Range clonedRange = parag.Range;
cloneRange.Start = 0;
cloneRange.End = 15;
cloneRange.Text = "";
Also Thank you to varocarbas :)