[SOLVED] Creating projects before the current date for archive purpose.

Hello,
We are trying to insert some of our previous projects into ProjeQtor and I'm having trouble with the start date. 
We're doing this for reference purpose and also to have a track reccord of our developpement work. 

When I insert a start date of January 1st 2021, the start date defaults to today's date.  
Is there a way to force the system to accept Project structures (Project' Activities and expenses, etc)   before the current date? 
Thanks
 

Thanks for the references.  It will be helpfull.  

I did some digging last night and I think I found a way to do this. 
I changed the parameter : Do not start before validdated date to NO

Then I entered : IN PROGRESS date and DONE date.
This seems to give me the result I want.

My next step will be to import the Activities by EXCEL table in the same manner and I should have my archived project structure.  I will also have to look at including the Assigned, real and left work for cost calculations. 

Thanks