Currently, to add a Service Item to a Contract, we have to add each item in the Contract line by selecting the Service Item No. in the column.

When the list opens in the Service Items page, you have the option to multi-select. But this only adds the last item into the Contract line.

For a Contract with 100 Service Items, there is no way to multi-select to add into the Contract so it is a time-consuming way to individually add each Service Item. This multi-selection feature would be similar to adding multiple items into a Sales Order through "Manage> Select Lines" option in the Sales Order line FastTab.