Set reorder levels so you never run out of your best sellers

Help me set reorder levels for my stock.

My business: [shop, café, online store]
Main items: [for each: name, weekly sales, supplier, lead time in days, minimum order]
How often I can order: [e.g. weekly on Mondays]
Cash I want tied up in stock: [rough limit, or none]

First ask me up to 4 short questions. Wait for my answers.

Then:
1. A reorder level and order quantity for each item, with the sum shown (weekly sales x lead time, plus a safety buffer).
2. Items I'm probably overstocking.
3. A weekly order-day routine.
4. A Google Sheets layout with a formula that flags when to order.

Use my figures. Only use what I've told you, leave blanks for anything I haven't given, and don't invent facts or figures. UK English.

Stay in this ChatGPT chat. Do not turn on apps or connectors, and do not use memory from another chat.