Ability to Exclude Order Channels from 30/60/90 day Sales Figures

Hello, we use certain order channels to hold, move or donate stock. However, these figures are all contributing to our 30/60/90 day global sales figures. Our buying team then buy more of these items as it looks to them as if they are high sellers when in reality we are simply giving this stock away. Please could we exclude certain channels from these figures as effectively they are not sales.