Return Multiple Values Using Index

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This is an array formula, it has to be entered with Ctrl + Shift + Enter, not just Enter.
The {} should not be typed, they will appear as a confirmation that you did use CSE.

But I'm not sure how that formula will concatenate anything...

Will you please attach a sample Excel workbook? We are not able to work with or manipulate a picture of one and nobody wants to have to recreate your data from scratch.

1. Make sure that your sample data are REPRESENTATIVE of your real data. The use of unrepresentative data is very frustrating and can lead to long delays in reaching a solution.

2. Make sure that your desired solution is also shown (mock up the results manually).

3. Make sure that all confidential data is removed or replaced with dummy data first (e.g. names, addresses, E-mails, etc.).

4. Try to avoid using merged cells as they cause lots of problems.

Unfortunately the attachment icon doesn't work at the moment, so to attach an Excel file you have to do the following: just before posting, scroll down to Go Advanced and then scroll down to Manage Attachments. Now follow the instructions at the top of that screen.

Please pay particular attention to point 2 (above): without an idea of your intended outcomes, it is often very difficult to offer appropriate advice.

We can't troubleshoot your formula in that file.

This would be easy to accomplish if you have Office365 subscription. That way you could use TEXTJOIN function. However, this can be done with a UDF (VBA).

1. Copy code below
2. Press Alt and F11 on your keyboard to open VB Editor
3. Click on Insert and select Module
4. Paste code into Module and close VB Editor.

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then use formula:
Enter in C2 and copy down

Formula:

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v	A	B	C
1	stID	Name	DesiredOutput
2	1	Blue	Blue, Blue
3	1	Blue	Green
4	2	Green	Red, Red
5	3	Red
6	3	Red

Why is that? For example, if you input my formula above into cell F3 - my desired return result would be Green since A4 = 2 and the only value associated with 2 is Green.

You said you were having trouble with a formula in post #3, so I asked for a sample workbook with the intention of helping you to troubleshoot it, but there is no formula attempted in your file that I can help to troubleshoot.

Hey, jo15765. I think the idea is that you implement that formula in your workbook with sample data, to the best of your knowledge, and post that. That way we have something to work with and it makes it much easier to help you.
You will in many threads that this is what the forum experts ask from the threadstarter.