Q: If Skugrid identifies a price increase on my supplier, I want to increase my listing price by the same amount. How can I do that?
A: Sku Grid doesn't really work that way. If you allow Sku Grid to control your prices, it's going to set prices based on current supplier price + your formula. It does not consider what your current listing price is. So if you list an item and add it into sku grid for tracking, the first time it handles the item, your price is going to change, unless you created an override formula on the item that produces the current selling price that you have. That would be ideal.
As far as increasing in direct proportion to a supplier price increase... it doesn't do that, and even to do so, would technically result in losses since as yours supplier increases by $1, your selling price increases -- therefore your amazon fees increase. It would not be right to do a dollar for dollar change in that sense.
But whatever your formula is in Sku Grid, Sku Grid will always adjust your price so that you maintain those margins (profit).