Create SharePoint List Collection in Microsoft PowerApps
in this image create static data collection using this code run on Button OnSelect
ClearCollect(SivaEnterprise,{ProductNo: 100,ProductName: "Keyboard",Rate: 500}, {ProductNo: 579,ProductName: "Mouse",Rate: 600}, {ProductNo: 112,ProductName: "DVD",Rate: 1500}, {ProductNo: 856,ProductName: "Modem",Rate: 500}, {ProductNo: 469,ProductName: "Processor",Rate: 5000})
So, How to create this type of collection in PowerApp Application collection from SharePoint DataSource (SharePoint List)