the slots do not increase after they are researched

[Manfred von Holstein]

the research blueprint slot & sales slot don't increase after they are researched

[lordsteel166]

Oh yeah that tripped me up as well, you need to lay out a New Sales/Research zone not just add more stuff to a already made zone. took me 20 min to figure it out.

[RyaStream]

agreed this has to be a bug. only 1 sales slot is allowed in a sales zone at a time no matter how much you upgrade in the tech tree.

[El Presidente]

Originally posted by RyaStream:

agreed this has to be a bug. only 1 sales slot is allowed in a sales zone at a time no matter how much you upgrade in the tech tree.

The game tells you this. It is not a bug.

[Dead Already]

I see a member of the studio say on someone's live twitch stream that this is intentional, you have to create a new zone rather than build a new slot... Though the game video shows adding multiple slots to one zone.
It is a confusing and not well implemented or explained feature.
To create a sales area without gaps they said to drag out a small area with a square gap from an existing area, then resize it. Seems way convoluted because they have linked the car sales data to the zone instead of the more logical sales slot displays.

[Manfred von Holstein]

In the old demo version, all slots were within one zone, which confused me.