This is a very common setup. All you need to do is when configuring the crypto access-lists specify the destination as any at the branch office and at the HQ specify the source as any. for example:
HQ
access-list S2S_VPN permit ip any 192.168.1.0 255.255.255.0
Branch
access-list S2S_VPN permit ip 192.168.1.0 255.255.255.0 any
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