Hi Tracy ,
it is not clear which ISO you are moving to is it 22000 or ISO 9000 ,or other ISO ,there are a lot
I mean is your system will be quality system or food safety and quality system,
could you please give us more data about the your organisation's scope is it food processing , distribution ,laboratory .....! and which ISO serious you are aiming.
General according to the above I can generally say :
I may understand from old and new that they are the same contents,scope,... with the amendments and/or updates , so the new one replaces the old one .
The answer is no , the it is as I understand it is a replacement ,you should have one manual for not confusion , it is recommended to declare that the new manual is replacing the old manual ,for example QM-01.02 replaces QM-01.01 or replaces V.1 or replaces QM issued on dd.mm.yy this could be in your document control records .
the old manual should not be available after starting with the new one , if you want to keep it as a historical reference you should label it (or stamped it ) with clear message Obsolete or Replaced by QM-xxxx ( new version code ).
this is for all document, the duplication within the same name/process without distinguish which is valid and which is obsolete or replaced is a non conformance .
the ONLY case that you will have a two quality manuals is to have efferent scopes each one has a scope and it is declared in the scope but in this case will not be used old and new because they are different .
I wish this answers your query ,