Mutate Data before Create (calculated column)

Hello.
I need to calculate a column with series & id.
The fields are Id, Series, NumExp and I need numExp to be equal to SERIES-ID

If series is ABC and id is 20, I need numExp to be ABC20

I have tried this mutateFormDataBeforeCreate but it is not working.

protected function mutateFormDataBeforeCreate(array $data): array
    {
        $data['numExp'] =  $data['serie'] . '-' . $data['id'];
        return $data;
    }

protected function mutateFormDataBeforeCreate(array $data): array
    {
        $data['numExp'] =  $data['serie'] . '-' . $data['id'];
        return $data;
    }

protected function mutateFormDataBeforeCreate(array $data): array
    {
        $data['numExp'] =  $data['serie'] . '-' . $data['id'];
        return $data;
    }

protected function mutateFormDataBeforeCreate(array $data): array
    {
        $data['numExp'] =  $data['serie'] . '-' . $data['id'];
        return $data;
    }

Is there a boot method in the Model or something, please?
Tks.

Solution

Finally I have created an Observer.

Thank you.

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Mutate Data before Create (calculated column)

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