The Scenario
You're a founder who writes LinkedIn content in bursts. You've got five posts planned for this week — each one structured as a main thought in column A and a follow-up comment in column B that you want threaded underneath. Scheduled dates are in column C.
You wrote all five on Sunday. It's now Monday morning, and you have exactly one hour before a full day of calls starts.
The bad version:
- Open Postiz, go to the post composer, paste the main caption from column A, add the comment from column B as a thread reply, select your LinkedIn integration, set the date from column C, submit.
- Switch back to the workbook, note the post ID somewhere, move to row two.
- On row three, realize you pasted the wrong column B value into the comment field — and you've now scheduled the wrong thread for that post.
Five posts done this way takes 30–40 minutes when you're careful. One error and it's 45. You don't have 45 minutes.
The Easy Way: One Prompt in SheetXAI
SheetXAI is an AI agent inside your Excel workbook. It reads each row — main caption, comment, scheduled date — and schedules each LinkedIn post through Postiz with the comment appended as a thread reply, writing the returned post ID into column D.
Schedule 5 LinkedIn posts from the Thread Calendar tab — main post text in column A, first reply in column B, date in column C — using Postiz's multi-comment post format, writing post IDs into column D.
What You Get
- Five LinkedIn posts scheduled to your connected Postiz integration, each with the correct thread reply attached.
- Post IDs land in column D as each one completes — you can verify the schedule in Postiz without hunting for anything.
- Any row where the date is missing or the caption is blank surfaces with a note in column D rather than a silent failure.
- Your Sunday writing session becomes your full week's LinkedIn presence, scheduled before the first call of Monday.
What If the Data Is Not Quite Ready
The dates in column C are relative ("this Thursday", "next Monday") rather than fixed dates
Convert each relative date in column C to an explicit YYYY-MM-DD datetime (using today as the reference date), write the converted dates into column E, then schedule each LinkedIn thread post using column A for the main caption, column B for the comment, and column E for the date — write post IDs into column D.
Some rows have a second follow-up comment in column D that should be a second thread reply
For each row in the Thread Calendar worksheet, schedule a Postiz LinkedIn post using the caption in column A, append column B as the first thread reply and column D as the second thread reply, using the date in column C — write the returned post ID into column E.
The main captions in column A are too long for LinkedIn's character limit
For each row in the Thread Calendar worksheet, trim the caption in column A to under 3000 characters while preserving the main argument, write the trimmed version into column F, then schedule the post using column F for the caption, column B for the thread comment, and column C for the date — write post IDs into column D.
I want caption polish, date conversion, and scheduling all handled in one pass
For each row in the Thread Calendar worksheet: tighten any caption in column A that exceeds 2000 characters, convert any relative date in column C to an explicit ISO datetime, then schedule the LinkedIn post using the polished caption and corrected date with the comment from column B as a thread reply — write post IDs into column D.
One prompt, five posts, one Monday morning hour well spent.
Try It
Get the 7-day free trial of SheetXAI and open any Excel workbook where you've drafted a week's worth of LinkedIn threads — ask it to schedule every row into Postiz with the right comment attached. Also worth reading: Bulk schedule a content calendar and the Postiz MCP hub overview.