I've never been 100% clear on this, but in standing order 4c we refer to advisory committees and sub-committees that need not include councillors, which differ from the standing committees in 4d. So I presume that these advisory committees are what we often refer to as working parties, task and finish groups, and a host of other names. So 4di dictates that, for "other committees", the council shall determine their terms of reference and all the ensuing details, ignoring those that refer specifically to standing committees.
Taking a wider view, you can't delegate something without defining the extent of the delegation, particularly with regard to the use of council resources. I find it helpful to include timelines in delegation too, as it provides an incentive to stay focussed on the task in hand.