diff --git a/CHANGELOG.md b/CHANGELOG.md
index a64730fe..c0ea91fe 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -65,6 +65,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
   PR: https://egit.irs.uni-stuttgart.de/fsfw/fsfw/pulls/559
 - Added ETL dependency and improved library dependency management
   PR: https://egit.irs.uni-stuttgart.de/fsfw/fsfw/pulls/592
+- `Subsystem`: New API to add table and sequence entries
 
 ## Fixed
 
diff --git a/src/fsfw/subsystem/Subsystem.cpp b/src/fsfw/subsystem/Subsystem.cpp
index ab8c1b16..27e6ae8e 100644
--- a/src/fsfw/subsystem/Subsystem.cpp
+++ b/src/fsfw/subsystem/Subsystem.cpp
@@ -307,6 +307,11 @@ void Subsystem::replyToCommand(ReturnValue_t status, uint32_t parameter) {
   }
 }
 
+ReturnValue_t Subsystem::addSequence(SequenceEntry sequence) {
+  return addSequence(sequence.table, sequence.mode, sequence.fallbackMode, sequence.inStore,
+                     sequence.preInit);
+}
+
 ReturnValue_t Subsystem::addSequence(ArrayList<ModeListEntry> *sequence, Mode_t id,
                                      Mode_t fallbackSequence, bool inStore, bool preInit) {
   ReturnValue_t result;
@@ -350,6 +355,10 @@ ReturnValue_t Subsystem::addSequence(ArrayList<ModeListEntry> *sequence, Mode_t
   return result;
 }
 
+ReturnValue_t Subsystem::addTable(TableEntry table) {
+  return addTable(table.table, table.mode, table.inStore, table.preInit);
+}
+
 ReturnValue_t Subsystem::addTable(ArrayList<ModeListEntry> *table, Mode_t id, bool inStore,
                                   bool preInit) {
   ReturnValue_t result;
@@ -458,6 +467,7 @@ ReturnValue_t Subsystem::initialize() {
   }
 
   mode = initialMode;
+  submode = initSubmode;
 
   return RETURN_OK;
 }
@@ -595,7 +605,10 @@ ReturnValue_t Subsystem::checkObjectConnections() {
   return RETURN_OK;
 }
 
-void Subsystem::setInitialMode(Mode_t mode) { initialMode = mode; }
+void Subsystem::setInitialMode(Mode_t mode, Submode_t submode) {
+  this->initialMode = mode;
+  this->initSubmode = submode;
+}
 
 void Subsystem::cantKeepMode() {
   ReturnValue_t result;
diff --git a/src/fsfw/subsystem/Subsystem.h b/src/fsfw/subsystem/Subsystem.h
index f1e7228d..855c8f7a 100644
--- a/src/fsfw/subsystem/Subsystem.h
+++ b/src/fsfw/subsystem/Subsystem.h
@@ -10,6 +10,28 @@
 #include "fsfw/FSFW.h"
 #include "modes/ModeDefinitions.h"
 
+struct TableSequenceBase {
+ public:
+  TableSequenceBase(Mode_t mode, ArrayList<ModeListEntry> *table) : mode(mode), table(table){};
+  Mode_t mode;
+  ArrayList<ModeListEntry> *table;
+  bool inStore = false;
+  bool preInit = true;
+};
+
+struct TableEntry : public TableSequenceBase {
+ public:
+  TableEntry(Mode_t mode, ArrayList<ModeListEntry> *table) : TableSequenceBase(mode, table){};
+};
+
+struct SequenceEntry : public TableSequenceBase {
+ public:
+  SequenceEntry(Mode_t mode, ArrayList<ModeListEntry> *table, Mode_t fallbackMode)
+      : TableSequenceBase(mode, table), fallbackMode(fallbackMode) {}
+
+  Mode_t fallbackMode;
+};
+
 /**
  * @brief   TODO: documentation missing
  * @details
@@ -44,13 +66,15 @@ class Subsystem : public SubsystemBase, public HasModeSequenceIF {
             uint32_t maxNumberOfTables);
   virtual ~Subsystem();
 
+  ReturnValue_t addSequence(SequenceEntry sequence);
   ReturnValue_t addSequence(ArrayList<ModeListEntry> *sequence, Mode_t id, Mode_t fallbackSequence,
                             bool inStore = true, bool preInit = true);
 
+  ReturnValue_t addTable(TableEntry table);
   ReturnValue_t addTable(ArrayList<ModeListEntry> *table, Mode_t id, bool inStore = true,
                          bool preInit = true);
 
-  void setInitialMode(Mode_t mode);
+  void setInitialMode(Mode_t mode, Submode_t submode = SUBMODE_NONE);
 
   virtual ReturnValue_t initialize() override;
 
@@ -89,6 +113,7 @@ class Subsystem : public SubsystemBase, public HasModeSequenceIF {
   Submode_t targetSubmode;
 
   Mode_t initialMode = 0;
+  Submode_t initSubmode = SUBMODE_NONE;
 
   HybridIterator<ModeListEntry> currentSequenceIterator;