hi,
I use the command line interface most of the time when configuring ASA and what I usually do is create my own template on Notepad++, which sometimes requires a quite of manual process(it depends how bulk the config change).
If the host ip addresses that you wanted to add are in sequence, for example 192.168.1.1-100 then it will be easier if you copy network-object host 192.168.1.1 to Excel then hover your mouse cursor on the cell's right most bottom corner until it turns into "+" sign then drag down the mouse cursor to auto populate everything including the sequential host ip addresses. After this, add object-group network [your object group network id] on top of the first network-object host [ip address] then apply the whole thing to the ASA through command line interface.
If the host ip addresses are not in sequence, I would copy and paste network-object host on Notepad++ then press Ctrl+D multiple times until you reach the number of host ip address that you need to add. At the end of each network-object host command, add the host ip address. Once this is done, on top of the first network-object host [ip address], add object-group network [your object group network id] then apply the whole thing to the ASA through command line interface.
HTH,
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