[exim] Calling an acl from another acl

Hi,

Is it possible to call an acl from another acl? Something like..

acl_smtp_data = acl_smtp_data_custom

acl_smtp_data_custom:
...
...
...
if there exist acl_smtp_data_custom1, then process the conditions of
acl_smtp_data_custome1

--

Thanks in advance.

Regards,
Soumya