How can I clear Consolidations/Reset balances for just the one month

SUGGESTED

Lomg story short, I am still learning Sage 200 c Professional, in Jun I ran Consolidations for the first half of the year under one route, (using a certain Exchange rate that had been advised checked and all great.

Ran it the same way for July. and found it doesn't match, only to find the rate from July had been changed without me knowing. So now I have incorrect/non-matching values from the workbooks of my colleagues to sage. 

The question mainly is, is there a way to just clear the consolidations / Reset the values for July, so that I do not have to clear every single entry and start the whole lengthy process all over again. (To put in time and size, I have about 15 companies that get consolidated)

This really is such a nuisance if there is no other way other than clearing ALL consolidations.