//main class
public static class ICMS {

                    @XmlElement(name = "ICMS00")
                    protected TNFe.InfNFe.Det.Imposto.ICMS.ICMS00 icms00;
                    @XmlElement(name = "ICMS10")
                    protected TNFe.InfNFe.Det.Imposto.ICMS.ICMS10 icms10;
                    @XmlElement(name = "ICMS20")
                    protected TNFe.InfNFe.Det.Imposto.ICMS.ICMS20 icms20;
                    @XmlElement(name = "ICMS30")
                    protected TNFe.InfNFe.Det.Imposto.ICMS.ICMS30 icms30;
                    @XmlElement(name = "ICMS40")
                    protected TNFe.InfNFe.Det.Imposto.ICMS.ICMS40 icms40;
                    @XmlElement(name = "ICMS51")
                    protected TNFe.InfNFe.Det.Imposto.ICMS.ICMS51 icms51;
                    @XmlElement(name = "ICMS60")
                    protected TNFe.InfNFe.Det.Imposto.ICMS.ICMS60 icms60;
                    @XmlElement(name = "ICMS70")
                    protected TNFe.InfNFe.Det.Imposto.ICMS.ICMS70 icms70;
                    @XmlElement(name = "ICMS90")
                    protected TNFe.InfNFe.Det.Imposto.ICMS.ICMS90 icms90;
                    @XmlElement(name = "ICMSPart")
                    protected TNFe.InfNFe.Det.Imposto.ICMS.ICMSPart icmsPart;
                    @XmlElement(name = "ICMSST")
                    protected TNFe.InfNFe.Det.Imposto.ICMS.ICMSST icmsst;
                    @XmlElement(name = "ICMSSN101")
                    protected TNFe.InfNFe.Det.Imposto.ICMS.ICMSSN101 icmssn101;
                    @XmlElement(name = "ICMSSN102")
                    protected TNFe.InfNFe.Det.Imposto.ICMS.ICMSSN102 icmssn102;
                    @XmlElement(name = "ICMSSN201")
                    protected TNFe.InfNFe.Det.Imposto.ICMS.ICMSSN201 icmssn201;
                    @XmlElement(name = "ICMSSN202")
                    protected TNFe.InfNFe.Det.Imposto.ICMS.ICMSSN202 icmssn202;
                    @XmlElement(name = "ICMSSN500")
                    protected TNFe.InfNFe.Det.Imposto.ICMS.ICMSSN500 icmssn500;
                    @XmlElement(name = "ICMSSN900")
                    protected TNFe.InfNFe.Det.Imposto.ICMS.ICMSSN900 icmssn900;
}

 public static class ICMS00 {

                        @XmlElement(required = true)
                        protected String orig;
                        @XmlElement(name = "CST", required = true)
                        protected String cst;
                        @XmlElement(required = true)
                        protected String modBC;
                        @XmlElement(name = "vBC", required = true)
                        protected String vbc;
                        @XmlElement(name = "pICMS", required = true)
                        protected String picms;
                        @XmlElement(name = "vICMS", required = true)
                        protected String vicms;
}

 public static class ICMS10 {

                        @XmlElement(required = true)
                        protected String orig;
                        @XmlElement(name = "CST", required = true)
                        protected String cst;
                        @XmlElement(required = true)
                        protected String modBC;
                        @XmlElement(name = "vBC", required = true)
                        protected String vbc;
                        @XmlElement(name = "pICMS", required = true)
                        protected String picms;
                        @XmlElement(name = "vICMS", required = true)
                        protected String vicms;
                        @XmlElement(required = true)
                        protected String modBCST;
                        @XmlElement(name = "pMVAST")
                        protected String pmvast;
                        protected String pRedBCST;
                        @XmlElement(name = "vBCST", required = true)
                        protected String vbcst;
                        @XmlElement(name = "pICMSST", required = true)
                        protected String picmsst;
                        @XmlElement(name = "vICMSST", required = true)
                        protected String vicmsst;
}
//And it goes on for all other ICMS variations