Creeping barrage?

Rolling barrages are just possible with multiple mortar/artillery-assets with different timing setting.
 
Or you could use a long duration barrage from one asset and adjust it deeper and deeper into the advance. Unfortunately, none of these methods lets you roll a barrage over places that your observers can't spot (at least the ends of the line) without the use of TRPs. Actually, thinking about it, that would be how you'd emulate a pre-planned barrage: a line (or 2 if you want a barrage wider than 100m) of TRPs along the axis of movement of the barrage, with a long duration mission that you then adjust.
 
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