MODCHQ - SET UP AND MAINTENANCE Ó UNCTAD – SITE (V1.15) 10.27 Excluding  part  of  the  range  initially  selected  can  further  refine  range  selections.  The  following example illustrates this point: Additional Selections To further refine or restrict the range of commodity codes upon which to carry out the action specify additional  selection.  This  permits  more  precise  definition  within  the  chosen  Tariff  range,  using  a number of criteria apart from the Commodity Code. Update 'Actions' After making the selection, specify the  ‘Action’ to be carried out on the selected range. 'Actions' allow  the  addition,  deletion,  or  replacement  of  Tariff  related  components.  These  are  the  Tariff components, i.e., Statistical Units, Market Value, Rule, National Note, Taxation/Duty rates, that are directly inserted or amended through the Commodity Code screen. After planning the extent of the update, an appropriate 'Action' is selected by using the space bar to cycle through the available options. Careful 'planning' is stressed, because of the potential difficulty in reversing any ill-considered or incorrect update. Examples: a) [01] + [03] + [040210]  - selects chapters 1, 3 and sub-heading 040210. b) [8501, 8506] + [91] selects all commodities in the range from heading 8501 to heading 8506, plus all of chapter 91. Example: [55] - [5503] selects all the commodities of chapter 55 except commodities of heading 5503. Fig. 10.21 MODCHQ: Functions: Database Management: Simplified Management: Customs Tariff