You'd usually use one light source set

[undone talon]

oh. so the floor will have baked light and the moving object can have realtime shadows?

so i dont have to bake the floor separately and have a 2nd light for shadows?

[haughty field]

Yes

[azure flint]

Yep. One light source can be bpth static and dynamic

[haughty field]

There are multiple methods to mix baked and realtime light in that scenario
https://docs.unity3d.com/Manual/class-LightingSettings.html#MixedLighting

[undone talon]

ok so i tried mixed now my objects have shadows that move when the objets move.

how do i assign which objects should cast static shadows and which objects cast dynamic shadows?

is there something that i have to check here?

[haughty field]

Contribute GI

In some mixed light modes static objects cast dynamic shadows too

Because they are of higher quality

[undone talon]

enabling contribute GI makes it cast shadows but they move when moved. i want them baked to the floor

[haughty field]

Subtractive mode seems to be what you want

Subtractive mode relies on "shadow color" property for mixing realtime and baked shadows

[undone talon]

subtractive makes both my objects as baked shadows

so basically i have a cube and a sphere where i want the sphere to have dynamic shadow whereas the cube should have its shadow baked to the floor.

in subtractive mode both shadows are baked to the floor

this is in subtact

[haughty field]

The cube and the floor should have Contribute GI on, the sphere should have it off

[undone talon]

oh thank you good sir that is exactly what i want

so it only works in subtractive mode i see

is subtractive an expensive method?

[haughty field]

The cheapest one of the mixed light modes

As I understand it has almost no extra cost compared to just a realtime light, and it can do indirect lighting
Downside is the blending of baked and realtime shadows may be impossible to get totally perfect

[undone talon]

Thank you, that makes sense. guess there has to be some kind of tradeoff

[undone talon]

can i do multiple bakes with different lights? Currently i am working on a night scene for which i want to light a stadium with some spot lights. so for the area around the field im using a variety of lights. i bake the whole scene with these lights. now the main problem i am facing is I need a real time shadow that moves with the player in the field for which i have a directional light it again lights the scene and makes it brighter. is there any other workaround for this?

[haughty field]

As you've described it, it's the problem you originally had solved by mixed lights
Why are they not an option in this case?
Or maybe I misunderstand
Shadows are an absence of a light, a shadow can't necessarily be "dark" if another light is illuminating that shadow