other = {}
anchor = {"Позиция 1": "111", "Позиция 2": "222"}
plate = {"Позиция 1":"0,39"}
category = {"Категория 1": anchor, "Категория 2": plate, "Прочее":other}
from tkinter import *
root = Tk()
root.geometry("500x500")
categoryList = Listbox(root, width = 15)
categoryList.grid(row=0, column=0)
for i in category:
    categoryList.insert(END, i)
def doNothing(evt):
    print ("Do nothing")
def onSelectCategory(evt):
    print (evt.widget)
    itemsCounter = productList.size()
    
    if itemsCounter > 0:
        productList.delete(0, END)
    
    itemSelected = categoryList.get(categoryList.curselection())
    tableFill = {}
    if itemSelected == "Категория 1":
        tableFill = anchor
    elif itemSelected == "Категория 2":
        tableFill = plate
    elif itemSelected == "Прочее":
        tableFill = other
    for i in tableFill:
        productList.insert(END, i)
categoryList.bind('<<ListboxSelect>>', onSelectCategory)
productList = Listbox(root, width = 30)
productList.grid(row=0, column=1)
productList.bind('<<ListboxSelect>>', doNothing)
root.mainloop()

 import collections
from tkinter import *
import tkinter.ttk
other = collections.OrderedDict(
    [
    ("aa", "0.2"),
    ("bb", "0.435"),
    ("cc", "0.275"),
    ("dd", "7"),
    ("ee", "1")
    ])
anchor = collections.OrderedDict(
    [
    ('a', '1.6'),
    ('b', '2.45'),
    ('c', '3'),
    ('d', '3.9'),
    ('e', '1'),
    ('f', '1'),
    ('g', '1')
    ('h','1.1'),
    ('i', '1')
    ])
plate = collections.OrderedDict(
    [
    ("aa", "0.314"),
    ("bb", "0.39"),
    ("cc", "1.427")
    ])
category = collections.OrderedDict()
category["Анкера"]=anchor
category["Шайба"]=plate
category["Прочее"]=other
summ = {}
root = Tk()
root.title("Расчет веса")
tree = tkinter.ttk.Treeview(root)
tree["columns"]=("c","a","b")
tree.column("c", width=100 )
tree.column("a", width=100 )
tree.column("b", width=100)
tree.heading("c", text="Длина")
tree.heading("a", text="Количество")
tree.heading("b", text="Вес, кг")
tree.grid(row=3, columnspan=2)
lbl = Label(root, text = 'Количество')
enterFieldQ = Entry(root,width=10)
enterFieldQ.grid(row=2,column=1)
lbl.grid(row=1, column=0)
lbl1 = Label(root, text = 'Длина')
enterField = Entry(root,width=10)
enterField.grid(row=1,column=1)
lbl1.grid(row=2, column=0)
lblRes = Label(root, text="Итого:")
lblRes.grid(row=4, column=0)
lblRes1 = Label(root, text="")
lblRes1.grid(row=4, column=1)
categoryList = Listbox(root, width = 15)
categoryList.grid(row=0, column=0)
for i in category:
    categoryList.insert(END, i)
categorySelected = ""
totalW = 0
x=0
def addToTree(evt):
    global x
    global categorySelected
    global totalW
    global item
    print ("Pressed enter")
    quantity = enterField.get()
    length = enterFieldQ.get()
    if length == "":
        length = 1
    if quantity != "":
        weight = int(quantity)*float(category[categorySelected][item])
        weight = weight * float(length)
        weight = round(weight,2)
        tree.insert("" , x, text=item, values=(length,quantity,weight))
        totalW = totalW + weight
        totalW = round(totalW,2)
        lblRes1.configure(text=totalW)
        enterFieldQ.delete(0,END)
        enterField.delete(0,END)
        x=x+1
def onSelectCategory(evt):
    print("Category selected")
    global categorySelected
    itemsCounter = productList.size()
    if itemsCounter > 0:
        productList.delete(0, END)
    categorySelected = categoryList.get(categoryList.curselection())
    tableFill = {}
    if categorySelected == "Анкера":
        tableFill = anchor
    elif categorySelected == "Шайба":
        tableFill = plate
    elif categorySelected == "Прочее":
        tableFill = other
    for i in tableFill:
        productList.insert(END, i)
item=""
def onSelectItem(evt):
    print ("Item selected")
    global item
    item = productList.get(productList.curselection())
def doubleClick(evt):
    global totalW
    print("doubleClick")
    if totalW > 0:
        selected_item = tree.selection()[0]
        print (selected_item)
        curItem = tree.focus()
        minusWeight = float(tree.item(curItem)["values"][2])
        totalW = totalW - minusWeight
        totalW = round(totalW,2)
        lblRes1.configure(text=totalW)
        tree.delete(selected_item)
productList = Listbox(root, width = 30)
productList.grid(row=0, column=1)
productList.bind('<<ListboxSelect>>', onSelectItem)
categoryList.bind('<<ListboxSelect>>', onSelectCategory)
enterField.bind("<Return>", addToTree)
enterFieldQ.bind("<Return>", addToTree)
tree.bind("<Double-1>", doubleClick)
root.mainloop()