GUI and PDf

[joe_momma]

I think kevin wants to get the entries and save to pdf.(my interpretation),,
A couple of observations: Keep your code simple. it's easier to read and
modify later on. Start on a small scale.
You could do this with one class- this will make it easier
to pass attributes and objects. The use of the prefix self makes objects
global. Make a list of fields and use a for loop to create all you labels and entries.
Lastly I don't have the fpdf module but I hope this points you in the right direction.
Great you made a class let's deal with what you have.
you made this entry widget:

def __init__(self, parent, controller):
    #omitting the rest....
    manufacturer = tk.StringVar()
    manufacturer_entry = tk.Entry(self, textvariable = manufacturer, width =  "30")
    button2 = ttk.Button(self, text="Submit", 
                            command=lambda: controller.show_frame(sub))
    button2.place(x = 700, y =730)

modified to:

def __init__(self, parent, controller):
    #omitting the rest....
    self.manufacturer = tk.StringVar()
    manufacturer_entry = tk.Entry(self, textvariable = self.manufacturer, width =  "30")
    button2 = ttk.Button(self, text="Submit", 
                            command= self.get_info)
    button2.place(x = 700, y =730)
def get_info(self):
     manu= self.manufacturer.get()
     print(manu)

know this also can be done without the textvariable I don't see the point in using
in this application. here's a way to pull the string from the entry widget:

def __init__(self, parent, controller):
    #omitting the rest....
    
    self.manufacturer_entry = tk.Entry(self, width =  "30")
    button2 = ttk.Button(self, text="Submit", 
                            command= self.get_info)
    button2.place(x = 700, y =730)
def get_info(self):
     manu= self.manufacturer_entry.get()
     print(manu)