Welcome Phil!

You are having this problem because Crystal Reports doesn't let you use multi-dimensional arrays. You really need to have the first index be the department name and the second index be the time. The way to get around this is to use two arrays that stay in synch using a common index variable.

So in the subreport build the first array (a Shared variable) with the department names. Then as you go through the Detail records use a formula which loops through the first array to find where the current department name is in the index. Then use this number to add the time to the second array. That lets the two arrays stay in synch and the location of the department names match the location of the times in the second array.

I cover arrays and and give sample code for working with them in Chapter 7 of my Encyclopedia book. You can find out more about my books at Amazon.com or reading the Crystal Reports eBooks online.