# Forecast inventory and auto-generate reorders: n8n workflow

> Started by an event in a connected app, and works across Google Sheets and Slack. It hands the judgement calls to OpenAI.

Source: https://millionrounds.com/workflow/forecast-inventory-and-auto-generate-reorders (Millionrounds; every figure on the page links to its filing or article)

[Automation library](https://millionrounds.com/workflows) · [E-commerce](https://millionrounds.com/workflows?category=E-commerce#library)

# Forecast inventory and auto-generate reorders

Started by an event in a connected app, and works across Google Sheets and Slack. It hands the judgement calls to OpenAI. 14 steps, 1 branch: a working afternoon to understand properly.

Medium Calls a model: OpenAI

[Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fforecast-inventory-and-auto-generate-reorders)

**14 steps** Medium: a working afternoon

**1** Branch: places the flow splits

**0** Loops or waits

**2** Services it connects to

## The flow

Starts it 1 Model 2 Logic 7 Service 4

The steps in the order they run, from what starts it.

- 1 **When clicking 'Execute workflow'** Manual trigger *Starts it*
- 2 **OpenAI Chat Model** Lm Chat Open Ai *Model*
- 3 **Set Forecast Configuration** Set *Logic*
- 4 **Demand Forecast Agent** Agent *Model*
- 5 **Fetch Sales History** Google Sheets *Service*
- 6 **Fetch Current Inventory** Google Sheets *Service*
- 7 **Combine Forecast and AI Output** Code *Logic*
- 8 **Merge** Merge *Logic*
- 9 **Critical Stock Exists?** If *Logic*
- 10 **Build Forecast Dataset** Code *Logic*
- 11 **Send a message** Slack *Service*
- 12 **Write Forecast to Sheet** Google Sheets *Service*
- 13 **Generate Purchase Orders** Code *Logic*
- 14 **Log Forecast Completion** Set *Logic*

## How it's built

- **Starts on:** An event in a connected app
- **Steps:** 14, with 1 branch
- **Size:** Medium: a working afternoon
- **Connects to:** Google Sheets, Slack
- **Model:** OpenAI

## Questions

What does it need to run?

An n8n account, plus your own Google Sheets and Slack accounts, and a key for OpenAI. You connect your own accounts after importing it; none are included.

What starts it?

It starts on an event in a connected app.

Does it use AI?

Yes. It calls OpenAI. Model calls are billed by the provider, not by n8n.

How long does it take to set up?

Plan an afternoon. 14 steps is enough that you should read each one before running it.

How do I import it?

Copy the workflow, open a new workflow in n8n and paste. The steps appear on the canvas, ready for your own accounts.

**Before you run it**

Nothing here has been tested by us. It is somebody's working automation, read and described from its own steps. Treat the connections it wants as a list of accounts it will touch, and read the 14 steps before you point it at anything that matters.

## Run it in n8n

- **Create your n8n account** Free to start. n8n is where the workflow runs. [Create an n8n account ↗](https://millionrounds.com/n8n)
- **Download the workflow** Free with a Millionrounds account. [Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fforecast-inventory-and-auto-generate-reorders)
- **Paste it into n8n** Open a new workflow in n8n and paste. Then connect your own accounts.

Stored with the author's traces removed: canvas notes, instance identifiers, saved credential names and any live document they had left behind.

## Connects to

Each opens the other workflows that use it.

[Google Sheets](https://millionrounds.com/workflows?service=Google+Sheets#library)[Slack](https://millionrounds.com/workflows?service=Slack#library)

## Workflows like it

Also e-commerce, with the same services where possible, closest in size first.

- [**AI blog generator for Shopify product listings with OpenAI** 14 steps · calls a model · Google Sheets, Shopify](https://millionrounds.com/workflow/ai-blog-generator-for-shopify-product-listings-with-openai)
- [**AI-powered restaurant order chatbot with OpenAI** 14 steps · calls a model · Google Sheets](https://millionrounds.com/workflow/ai-powered-restaurant-order-chatbot-with-openai)
- [**Confirm and log WhatsApp restaurant orders with Groq** 14 steps · calls a model · Google Sheets, WhatsApp](https://millionrounds.com/workflow/confirm-and-log-whatsapp-restaurant-orders-with-groq)
- [**Create e-commerce listings from images with UploadToURL** 14 steps · calls a model · Shopify, Slack](https://millionrounds.com/workflow/create-e-commerce-listings-from-images-with-uploadtourl)
- [**Enhance product photos with Gemini** 14 steps · calls a model · Google Drive, Google Sheets](https://millionrounds.com/workflow/enhance-product-photos-with-gemini)
- [**Extract ecommerce product data with Google Sheets** 14 steps · calls a model · Google Sheets](https://millionrounds.com/workflow/extract-ecommerce-product-data-with-google-sheets)