Decrise of the Total number of a list dose n't calculate in the lable

Hello friends,I have some problem to decrise total number of a list of a column which I get from spreadsheet database(Airtable).First I get the list of column at screen initialization and then show it colin tree list view.Total number of the price is see currectly in the label.
By clicking collintree icon I delete each item of the list and each row of the airtable database…
Now I want to decrise total number by deleting each row of the airtable list showing in the label…
I am tring some days but I can’t solve it…Below I give my all blocks.


Please help me friends…Thank you…