Hello,
I am a freshman to power apps and I have searched on google and youtube, but I still have below question in my first trial in power apps built up.
Here I want to make a power apps for daily use, when the user selected the data in brand, grammage, size and ream fields, I hope there will be suggested answer in stock from customer field to limit the selection range. (If there will also be suggested answer in stock from batch and quantity field, it will be better, but I know I have to realize it step by step.)

I also have a raw data Excel sheet about stock in teamsite and will update automatically once an hour. In this sheet, we can get all these information I have mentioned above, but up to now, I don't know how to connect to it in power apps and make my thoughts come true.
Thanks in advance.