Can I change sentences like this?

[shabushabu]

Hi, can I say this:
After they have several discussions, the councils' biggest concern was not knowing where to begin.
= After having several discussions, the councils' biggest concern was not knowing where to begin.
= After having several discussions, not knowing where to begin was the councils' biggest concern.

Many thanks.

[bhaisahab]

Hi, can I say this:
After they have several discussions, the councils' biggest concern was not knowing where to begin.
= After having several discussions, the councils' biggest concern was not knowing where to begin.
= After having several discussions, not knowing where to begin was the councils' biggest concern.

Many thanks.

The original sentence is wrong.

[shabushabu]

Hi,

Then...what original sentence should be for "After having several discussions, not knowing where to begin was the councils' biggest concer"?

Many thanks

[MikeNewYork]

Hi,

Then...what original sentence should be for "After having several discussions, not knowing where to begin was the councils' biggest concer"?

Many thanks

The original sentence could be: "After they had several discussions, the councils' (council's in AmE) biggest concern...".
Some would use: "After they had had several discussions, the councils' (council's in AmE) biggest concern...".