How to configure CDC ACM for Control and Data interface

I Want to communicate Navigation device to TELEM Modem over CDC ACM, Now how to configure CDC ACM or by default port is CDC ACM.

The below code is for CDC EEM Ethernet
/* CDC EEM ---------------------------- /
static const sOpUsbItfInfo_t def_eem_class_if =
{
.iInterface = “CDC EEM Class Interface”,
.bNumEndpoints = 2, /
2 BULK EP */
.bInterfaceClass = 0x02,
.bInterfaceSubClass = 0x0C,
.bInterfaceProtocol = 0x07,
.ap_ep = ( ppsOpUsbEpInfo_t ) eem_def_settings
};

Now how to configure CDC-ACM control interface and data interface.

Control interface:
bInterfaceClass = 2
bInterfaceSubClass = 2

Data interface:
bInterfaceClass = 10 (0xA)
bInterfaceSubClass = 0

A USB interface descriptor for the control interface and
a USB interface descriptor for the data interface?