Modeling Operating WC for Retail using BS

I am trying to model working capital for a retail company using the balance sheet using DSO, DSI, Other Assets (days), Days AP/Accrued Outstanding, & Other Liabilities (days). I am unsure of whether to use all items shows in the "Changes in Assets & Liabilities" section of the CFS when trying to model out future working capital, so I was wondering if anyone could guide me on what to keep or exclude. I am new to retail so I apologize if this sounds dumb.

On CFS the calculation is done using (Assets bolded): A/R, Due from Related Parties, Other Current Assets, Accounts Payable & Accrued Expenses, Due to Related Parties, Operating Lease Liabilities, Deferred Income, Other Current Liabilities

The BS Asset items are easy enough: AR, Due From Related Parties, Inventories, Other Current Assets. The BS Liabilities: AP, Accrued Expenses, Due to Related Parties, Floorplan Payables, Current Portion of Deferred Income, Current Maturities of LT Debt, Current Portion of Operating Lease Liability

Which one of these should i disregard when doing my calculations (i.e., that are not "working capital" but are included for accounting purposes, for example operating leases)? How would you adjust the formulas for Days AP/Accrued Outstanding and Other Liabilities (days)?