Added feature: Split bill by Sales Category if no item is selected.

bookie/src/app/sales/split-bill/split-bill.component.css

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+.right {
+  display: flex;
+  justify-content: flex-end;
+}

bookie/src/app/sales/split-bill/split-bill.component.html

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+<h2 mat-dialog-title>Select Sale Categories</h2>
+<mat-dialog-content>
+  <form [formGroup]="form" fxLayout="column">
+    <div formArrayName="saleCategories">
+      <div
+        fxLayout="row"
+        *ngFor="let sc of list; index as i"
+        [formGroupName]="i"
+        fxLayout="row"
+        fxLayoutAlign="space-around start"
+        fxLayout.lt-md="column"
+        fxLayoutGap="20px"
+        fxLayoutGap.lt-md="0px"
+      >
+        <mat-checkbox formControlName="saleCategory" fxFlex>{{ sc.name }}</mat-checkbox>
+      </div>
+    </div>
+  </form>
+</mat-dialog-content>
+<mat-dialog-actions align="end">
+  <button mat-button [mat-dialog-close]="false">Cancel</button>
+  <button mat-button (click)="accept()" color="primary">Ok</button>
+</mat-dialog-actions>

bookie/src/app/sales/split-bill/split-bill.component.spec.ts

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+import { ComponentFixture, TestBed, waitForAsync } from '@angular/core/testing';
+
+import { SplitBillComponent } from './split-bill.component';
+
+describe('SplitBillComponent', () => {
+  let component: SplitBillComponent;
+  let fixture: ComponentFixture<SplitBillComponent>;
+
+  beforeEach(
+    waitForAsync(() => {
+      TestBed.configureTestingModule({
+        declarations: [SplitBillComponent],
+      }).compileComponents();
+    }),
+  );
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(SplitBillComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

bookie/src/app/sales/split-bill/split-bill.component.ts

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+import { Component, Inject } from '@angular/core';
+import { FormArray, FormBuilder, FormGroup } from '@angular/forms';
+import { MAT_DIALOG_DATA, MatDialogRef } from '@angular/material/dialog';
+import { Observable } from 'rxjs';
+
+@Component({
+  selector: 'app-split-bill',
+  templateUrl: './split-bill.component.html',
+  styleUrls: ['./split-bill.component.css'],
+})
+export class SplitBillComponent {
+  list: { id: string; name: string; selected: boolean }[] = [];
+  form: FormGroup;
+
+  constructor(
+    public dialogRef: MatDialogRef<SplitBillComponent>,
+    private fb: FormBuilder,
+    @Inject(MAT_DIALOG_DATA)
+    public data: Observable<{ id: string; name: string; selected: boolean }[]>,
+  ) {
+    this.form = this.fb.group({
+      saleCategories: this.fb.array([]),
+    });
+    this.data.subscribe((list: { id: string; name: string; selected: boolean }[]) => {
+      this.list = list;
+      this.form.setControl(
+        'saleCategories',
+        this.fb.array(
+          this.list.map((x) =>
+            this.fb.group({
+              saleCategory: x.selected,
+            }),
+          ),
+        ),
+      );
+    });
+  }
+
+  accept(): void {
+    const array = this.form.get('saleCategories') as FormArray;
+    this.list.forEach((item, index) => {
+      item.selected = array.controls[index].value.saleCategory;
+    });
+    this.dialogRef.close(this.list);
+  }
+}