To sum up the cost of several methods, you can use the Grouping Option. Here are the steps to be followed:

1. Go to X-Shippingpro -> Global setting -> Grouping, Now select a group e.g. Group1 to SUM

2. Now we have a group1 and we have to assign group method/member for this group.

3. To assign a method into a group, go to the general tab of a method, select the Group to Group1.

4. When X-Shippingpro finds several methods belongs to the same group during checkout,  X-Shippingpro takes the appropriate action and shows one method instead of showing them all.

For example, you have a `Method-1` and `Method-2` methods.  If customer want to purchase only from the `Method-2` or `Method-2`, group mode will not come into action. 

But when a customer wants to purchase from both `Method-1` and `Method-2`, it meets the group criteria and grouping will come into action. So shipping cost will be summed up and it displays the summed cost instead of showing separately.