How do you assign multiple numerical values to selected items in a combo box?

Hi, I'm creating an application that would allow me to calculate vapour pressures of at least 400 different chemicals with a user form.

To achieve that, I would need to pre-assign 3 different constants to each chemical (a, b, and c). So that when I select chemical X and provide other relevant inputs like temperature, it would be able to extract those values from a different workbook to perform the calculation.

Hence, I would like to know if there is a better way to do that instead of manually assigning each of them with pre-assigned values.

Thank you for your help.

a little more detail would be useful - upload a worksheet - not a picture - see big yellow banner.

Welcome to the forum

Please attach a sample workbook (not a picture or pasted copy). Make sure there is just enough data to demonstrate your need. Include a BEFORE sheet and an AFTER sheet in the workbook if needed to show the process you're trying to complete or automate. Make sure your desired results are shown, mock them up manually if necessary.

Remember to desensitize the data.

Click on GO ADVANCED and then scroll down to Manage Attachments to open the upload window.