ACan i replace a cup of milk with a cup of orange concentrate to change the cake to an orange cake?

AYou can but the orange flavor won't be very strong. I would suggest adding a box of orange jello to the recipe too. That will give it a strong orange flavor.

Ai think if you add the zest of an orange with the concentrate -- you'll get there -- rub the zest into some sugar to release all the oil --

if you do simple syrup splashes and a little alcohol is ok -- similar to the alcohol in vanilla extract -- do a grand Marnier splash to cap it off

This is my favorite orange cake recipe.  It is light and flavorful.  

3 cups cake flour (12 oz)

2 1/2 tsps baking powder 

1 tsp salt

1 cup (2 sticks, 8 oz) unsalted room temp butter

1 1/8 cup sugar

1/8 orange jello powder (can replace with sugar, but gives nice orange color to cake)

4 eggs

2 tsps finely grated orange zest

1/3 cup strained fresh orange juice

2/3 cup whole milk

1/4 tsp orange oil

Standard creaming technique:   cream butter, sugar jello. add eggs, then zest OJ and orange oil. whisk together dry ingredients, add in alternating with milk

I love orange cakes!! Thanks for the recipe. I am going to try this one maybe for xmas!!

AThank you everyone for your help. Will definitelytry the recipe.