Google sheets Product function with Month comparison - Stack Overflow
Create a product catalogue from Google sheets data
Creating an Advanced Product Organizer in Google Sheets with Duplicate Columns and Split Text Functionality
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try:
=ARRAYFORMULA(IFERROR(VLOOKUP(MONTH(N8:N),
{MONTH(Start!K13:K24&1), Start!L13:L24}, 2, )*R8:R))

Based on the limited information of your sheets. The following would multiply and sum each range if the months are matching:
=SUMPRODUCT(--(TEXT(N8:N1007,"mmmm")=Start!K13:K24),R8:R1007,Start!L13:L24)
Hello, I'm basically illiterate to what functions google sheets offer for things like this so my guess is that it is possible, but I don't know. I have a Google sheet with product data like name, price and an image of the product but because it's a large list which would have to be updated monthly probably I would like to be able to automatically use that data from the spreadsheet to create a pdf catalogue of such products that I can distribute to my clients. I've looked up a little bit and I think it's possible but most options I've found direct me to third party apps, videos that use a lot of coding on AppSheet (which I don't understand at all) so I was wondering if anyone knows an easy way to do this, it wouldn't have to be a super complicated pdf just basically 2 columns with 3 lines of products and just basically the picture, name, brief description and price, I figured that to add other things I might just use that pdf and edit it on canva or acrobat because I'm not to familiar with coding or design apps. Thank you in advance for reading my question.