Use Tkinter's .after method to run several named counters in parallel.

tk_multi_counters.py

#!/usr/bin/env python3

""" Use .after to run several named counters in parallel.

    Each counter prints its name and value to the terminal,
    once per second.
    When the 'New counter' button is clicked, a new
    counter is created, using the name in `name_entry`, and
    a 'Stop' button with the same name is added to the GUI.

    Written by PM 2Ring 2018.10.07
"""

import tkinter as tk

root = tk.Tk()

# The name for the next counter
name_entry = tk.Entry(root)
name_entry.insert(tk.END, 'A')
name_entry.pack()

# A dict to store the counter names & their Stop buttons
counters = {}

def start_counter():
    """ Create a new named counter and its Stop button """
    name = name_entry.get()
    if name in counters:
        # This name is already in use
        return
    # Create a stop button for this counter
    button = tk.Button(root, text='Stop ' + name, 
        command=lambda name=name: stop(name))
    button.pack()
    counters[name] = button
    # Start the counter
    counter(name, 0)

def stop(name):
    """ Destroy the stop button & remove the name """
    counters[name].destroy()
    del counters[name]

def counter(name, num):
    """ Print the counter name & value, and schedule the next call
        if the name is still in the counters dict
    """
    if name in counters:
        print(name, num)
        root.after(1000, lambda: counter(name, num + 1))

tk.Button(root, text='New counter', command=start_counter).pack()
root.mainloop()