They are going to walk.

You can say:

They will walk.

The phrase “will going to” puts two future tense verbs together, you would never say that.

The verb “will” is called a helper verb. When used with another verb, it can change it to future tense. Such as:

They will walk.

I will wash the dishes.

“Will be going to” always indicates a future act.

“Are going to” could be present or future tense depending on the context.

Unless you meant “will be going to”. We can discuss that.

or we are going to go to the movies..as in we will but not yet…

“will going to” doesn’t make sense, it can’t be used…its not propper….

“will be going to” could be used….?