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This is possible, during grid execution time to add a field/condition to the search WHERE clause.

Ex. 1: It adds the content between the quotes (") in the grids select.
if (empty({sc_where_current}))
{
sc_select_where(add) = "where campoX > [global]";
}
else
{
sc_select_where(add) = "AND campoX > [global_variable]";
}

Note: This command must be in the context of "process before the select".