I'm not sure that splitting makes when they are taken over by someone else is a good idea. Otherwise you would have to do the same for Rolls-Royce Jaguar, Bentley, Bugatti, etc.
After reflection I'd rather keep the two Mini together, and add a rule as suggested above to make it displaying differently depending on the era.

Hey, the forum site finally got an overhaul! Very nice.

Already since a few weeks:
https://imcdb.opencommunity.be/forum_topic-9976-94069-Forum_issues.html
but as long as your browser had the old style in cache you didn't see the changes

Thank you very much for the updates antp. Now we have this option, it would be great to split the Avia brand in two, one for the Czech, and another for the Spanish.
It's obviously not urgent.
Thank you again.

Indeed, I'll do that as soon as I've a few minutes

Done, I created a new page for the Spanish models:
https://imcdb.org/vehicles.php?make=Avia-AISA
And kept the other one for the Czech models, since that make is still active:
https://imcdb.org/vehicles.php?make=Avia

Thank you very much!

Thank you for the new updates on the site! Maybe next task would be splitting Star brand. It's a Polish truck manufacturer but also US and British car manufacturer.

Indeed, I'll split these.
edit: done
https://imcdb.org/vehicles.php?make=FSC-Star for the Polish company, since "FSC Star" was its full name
https://imcdb.org/vehicles.php?make=Star-Car for the US marque
https://imcdb.org/vehicles.php?make=Star-mc for the Yamaha motorcycles
https://imcdb.org/vehicles.php?make=Star for the UK marque

I'm wondering if Bristol should be split between cars and commercial vehicles:
https://en.wikipedia.org/wiki/Bristol_Cars
https://en.wikipedia.org/wiki/Bristol_Commercial_Vehicles

In fairness, the Tramway company and the Aerospace company were founded by the same person so possibly not as straightforward as I first thought.

If they are related and the Bristol brand is a name shared between companies, they should stay together. Like Renault or Volvo, where cars and trucks are made by different companies, but using the same "brand".
But that seems a more complicated case indeed And Bristol being a city, it does not make clear if they really "share" a brand or both use the name of the city. Since they are not complete strangers, I think it is easier to keep both under the same make on the site.
Another edge case was this one: https://www.imcdb.org/vehicles_make-Fiberfab.html
The German company was founded by someone from the original US company, and since they shared some models under licence it is easier to have both listed as only make.

https://www.imcdb.org/vehicle.php?id=1490695

New make ( Gibson ) found by Mike962 but i can't enter it as such since the system does not allow me to do so ( it insists that i pick something from the list )

You can create a new make either from the home page or from the "all makes" page: there is a "add make" link above the list of makes.
Some day later I'll maybe add such possibility directly in the "edit vehicle" page, but as there aren't so often new makes it was less urgent.

I've just added a new make - Serra - for this thing. Can't find a wiki page to fill in the box, or a logo or model list, so could only enter that it's Spanish. Result the make page is a bit bare on detail. However there is info out there - eg here or here.

So questions: have I done it right?? is there info from my 2 links you want to add to the make info??

Another new make here - claimed to be Transcraft and I believe them. But can't find any info to fill any boxes.

Update: have filled in some basic info on Serra, and after mike962 found a leaflet on Transcraft. Still only bare bones stuff, but not sure what else there is.

It is fine These fields are there if we want to add info when it is available, but it can also be quite empty if we don't have more.
Also, most of the existing 6000+ makes still don't have anything, since they were created automatically.
For recent makes it is easier to have info and logo of course.
Like here I've put the full company name, website link, and (one of the reason of this) a link to a related make: https://www.imcdb.org/vehicles_make-Suzhou-Eagle.html
When there is a Wikipedia page, I also sometimes included the first sentence of the page as description. Like here, where there is also the link to the other make sharing the name: https://www.imcdb.org/vehicles_make-Triumph.html