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local u1, u2, u3, u4;
local grpName = 'TG 10.1'
u1 = ScenEdit_AddUnit({type = 'Ship', name = 'RDAM', dbid = 825, side = 'Blue', Latitude="N9.30.00",Longitude="E109.30.00", heading=090, speed=12});
u1.group = grpName;
u2 = ScenEdit_AddUnit({type = 'Ship', name = 'TRMP', dbid = 891, side = 'Blue', Latitude="N9.31.00",Longitude="E109.31.00", heading=090, speed=12});
u2.group = grpName;
u3 = ScenEdit_AddUnit({type = 'Ship', name = 'ZLND', dbid = 2496, side = 'Blue', Latitude="N9.30.00",Longitude="E109.29.00", heading=090, speed=12});
u3.group = grpName;
u4 = ScenEdit_AddUnit({type = 'Ship', name = 'VSPK', dbid = 2522, side = 'Blue', Latitude="N9.29.00",Longitude="E109.31.00", heading=090, speed=12});
u4.group = grpName;
local g = ScenEdit_GetUnit({guid=u1.group.guid}); --get the group object wrapper using guid obtained from one of the member units group properties.
--local g = ScenEdit_GetUnit({side="Blue", name=grpName}); --alternate way but I use the above when I can.
--print(g.group); --dump the basic group objects properties. (there are more than what gets listed but they are in fields that dont print)
--print(g.group.unitlist); --dump the list of unit guids that are members of this group. (ie the 4 above created units)
print('current lead: ' .. g.group.lead); --list the guid of the current group lead which likley is first member or u1 in this case.
g.group.lead = u4.guid --operating on the group object's lead field (not shown in dump) set the group lead to the guid of ship 4.
print('new lead: ' .. g.group.lead); --show guid of the new lead (should see change).
--probably best to set the formations after the lead is changed.
u1.formation = {type='fixed', bearing=040, distance=4, sprint='false'}
u2.formation = {type='fixed', bearing=270, distance=2, sprint='false'}
u3.formation = {type='fixed', bearing=105, distance=2, sprint='false'}