how to split a class ?

[mimmo_kallon]

hi, i have to ask again your help, this time with a more c++ related question than Qt, but i am a newbie also on that topic and I wish you can help me on this very stupid question

i made my qt application with only one big class, with all the methods:

class App : public QMainWindow, public Ui::AppDLG{
public:
	App(QWidget *parent = 0);
	void readFileC(const QString &fileName);
	void update_comboBox(const QString &fileName,int type);
	QString norm(const QString &fileName,int type);
	QString norm_m(int type);
    ...
public slots:
	void getPath();
    void mod_norm();
	void new_sensor();
	void del_sensor();
    ....

class App : public QMainWindow, public Ui::AppDLG{
public:
	App(QWidget *parent = 0);
	void readFileC(const QString &fileName);
	void update_comboBox(const QString &fileName,int type);
	QString norm(const QString &fileName,int type);
	QString norm_m(int type);
    ...
public slots:
	void getPath();
    void mod_norm();
	void new_sensor();
	void del_sensor();
    ....

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i need to split up in a second class the methods norm(...) and norm_m(...) , and the slots mod_norm(...), new_sensor(...) and del_sensor(...).

i don't know how to organize my .h and .cpp files.... so i'm asking you the help and "what to place and where", and also how i can call the new objects created using that new class.

also a link with useful examples of easy qt projects using several classes will be appreciated.

thanks in advance.......... i'm a very newbie