I have all my details in order on my sheet but I now have to add another detail and it needs to be in the middle of my sequence...!
You have two options to resolve this issue:
1) Delete all the views and re-place them on the sheet. (remember to write down the sequence so you dont screw it up).
2) Select the last detail and in the properties you can change the detail number.
If your inserting a new detail on your sheet (for example the new detail you want to be number 4), you'll have to change the number of following details (4,5,6,7,8 and 9 etc) to the next digit up (5,6,7,8,9 and 10). This way you'll be able to change your new detail to the number location you want it to be (4 in this case).